2
* HWA Host Controller Driver
3
* Wire Adapter Control/Data Streaming Iface (WUSB1.0[8])
5
* Copyright (C) 2005-2006 Intel Corporation
6
* Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
8
* This program is free software; you can redistribute it and/or
9
* modify it under the terms of the GNU General Public License version
10
* 2 as published by the Free Software Foundation.
12
* This program is distributed in the hope that it will be useful,
13
* but WITHOUT ANY WARRANTY; without even the implied warranty of
14
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15
* GNU General Public License for more details.
17
* You should have received a copy of the GNU General Public License
18
* along with this program; if not, write to the Free Software
19
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
23
* This driver implements a USB Host Controller (struct usb_hcd) for a
24
* Wireless USB Host Controller based on the Wireless USB 1.0
25
* Host-Wire-Adapter specification (in layman terms, a USB-dongle that
26
* implements a Wireless USB host).
28
* Check out the Design-overview.txt file in the source documentation
29
* for other details on the implementation.
33
* driver glue with the driver API, workqueue daemon
35
* lc RC instance life cycle management (create, destroy...)
37
* hcd glue with the USB API Host Controller Interface API.
39
* nep Notification EndPoint managent: collect notifications
40
* and queue them with the workqueue daemon.
42
* Handle notifications as coming from the NEP. Sends them
43
* off others to their respective modules (eg: connect,
44
* disconnect and reset go to devconnect).
46
* rpipe Remote Pipe management; rpipe is what we use to write
47
* to an endpoint on a WUSB device that is connected to a
50
* xfer Transfer management -- this is all the code that gets a
51
* buffer and pushes it to a device (or viceversa). *
53
* Some day a lot of this code will be shared between this driver and
54
* the drivers for DWA (xfer, rpipe).
56
* All starts at driver.c:hwahc_probe(), when one of this guys is
57
* connected. hwahc_disconnect() stops it.
59
* During operation, the main driver is devices connecting or
60
* disconnecting. They cause the HWA RC to send notifications into
61
* nep.c:hwahc_nep_cb() that will dispatch them to
62
* notif.c:wa_notif_dispatch(). From there they will fan to cause
63
* device connects, disconnects, etc.
65
* Note much of the activity is difficult to follow. For example a
66
* device connect goes to devconnect, which will cause the "fake" root
67
* hub port to show a connect and stop there. Then khubd will notice
68
* and call into the rh.c:hwahc_rc_port_reset() code to authenticate
69
* the device (and this might require user intervention) and enable
72
* We also have a timer workqueue going from devconnect.c that
73
* schedules in hwahc_devconnect_create().
75
* The rest of the traffic is in the usual entry points of a USB HCD,
76
* which are hooked up in driver.c:hwahc_rc_driver, and defined in
80
#ifndef __HWAHC_INTERNAL_H__
81
#define __HWAHC_INTERNAL_H__
83
#include <linux/completion.h>
84
#include <linux/usb.h>
85
#include <linux/mutex.h>
86
#include <linux/spinlock.h>
87
#include <linux/uwb.h>
88
#include <linux/usb/wusb.h>
89
#include <linux/usb/wusb-wa.h>
93
extern void wa_urb_enqueue_run(struct work_struct *ws);
98
* @descr's fields are kept in LE, as we need to send it back and
101
* @wa is referenced when set
103
* @segs_available is the number of requests segments that still can
104
* be submitted to the controller without overloading
105
* it. It is initialized to descr->wRequests when
108
* A rpipe supports a max of descr->wRequests at the same time; before
109
* submitting seg_lock has to be taken. If segs_avail > 0, then we can
110
* submit; if not, we have to queue them.
114
struct usb_rpipe_descriptor descr;
115
struct usb_host_endpoint *ep;
118
struct list_head seg_list;
119
atomic_t segs_available;
120
u8 buffer[1]; /* For reads/writes on USB */
125
* Instance of a HWA Host Controller
127
* Except where a more specific lock/mutex applies or atomic, all
128
* fields protected by @mutex.
130
* @wa_descr Can be accessed without locking because it is in
131
* the same area where the device descriptors were
132
* read, so it is guaranteed to exist umodified while
135
* Endianess has been converted to CPU's.
137
* @nep_* can be accessed without locking as its processing is
138
* serialized; we submit a NEP URB and it comes to
139
* hwahc_nep_cb(), which won't issue another URB until it is
140
* done processing it.
144
* List of active transfers to verify existence from a xfer id
145
* gotten from the xfer result message. Can't use urb->list because
146
* it goes by endpoint, and we don't know the endpoint at the time
147
* when we get the xfer result message. We can't really rely on the
148
* pointer (will have to change for 64 bits) as the xfer id is 32 bits.
150
* @xfer_delayed_list: List of transfers that need to be started
151
* (with a workqueue, because they were
152
* submitted from an atomic context).
154
* FIXME: this needs to be layered up: a wusbhc layer (for sharing
155
* comonalities with WHCI), a wa layer (for sharing
156
* comonalities with DWA-RC).
159
struct usb_device *usb_dev;
160
struct usb_interface *usb_iface;
162
/* HC to deliver notifications */
168
const struct usb_endpoint_descriptor *dto_epd, *dti_epd;
169
const struct usb_wa_descriptor *wa_descr;
171
struct urb *nep_urb; /* Notification EndPoint [lockless] */
174
size_t nep_buffer_size;
176
atomic_t notifs_queued;
179
unsigned long *rpipe_bm; /* rpipe usage bitmap */
180
spinlock_t rpipe_bm_lock; /* protect rpipe_bm */
181
struct mutex rpipe_mutex; /* assigning resources to endpoints */
183
struct urb *dti_urb; /* URB for reading xfer results */
184
struct urb *buf_in_urb; /* URB for reading data in */
185
struct edc dti_edc; /* DTI error density counter */
186
struct wa_xfer_result *xfer_result; /* real size = dti_ep maxpktsize */
187
size_t xfer_result_size;
189
s32 status; /* For reading status */
191
struct list_head xfer_list;
192
struct list_head xfer_delayed_list;
193
spinlock_t xfer_list_lock;
194
struct work_struct xfer_work;
195
atomic_t xfer_id_count;
199
extern int wa_create(struct wahc *wa, struct usb_interface *iface);
200
extern void __wa_destroy(struct wahc *wa);
201
void wa_reset_all(struct wahc *wa);
204
/* Miscellaneous constants */
206
/** Max number of EPROTO errors we tolerate on the NEP in a
208
HWAHC_EPROTO_MAX = 16,
209
/** Period of time for EPROTO errors (in jiffies) */
210
HWAHC_EPROTO_PERIOD = 4 * HZ,
214
/* Notification endpoint handling */
215
extern int wa_nep_create(struct wahc *, struct usb_interface *);
216
extern void wa_nep_destroy(struct wahc *);
218
static inline int wa_nep_arm(struct wahc *wa, gfp_t gfp_mask)
220
struct urb *urb = wa->nep_urb;
221
urb->transfer_buffer = wa->nep_buffer;
222
urb->transfer_buffer_length = wa->nep_buffer_size;
223
return usb_submit_urb(urb, gfp_mask);
226
static inline void wa_nep_disarm(struct wahc *wa)
228
usb_kill_urb(wa->nep_urb);
233
static inline void wa_rpipe_init(struct wahc *wa)
235
spin_lock_init(&wa->rpipe_bm_lock);
236
mutex_init(&wa->rpipe_mutex);
239
static inline void wa_init(struct wahc *wa)
241
edc_init(&wa->nep_edc);
242
atomic_set(&wa->notifs_queued, 0);
244
edc_init(&wa->dti_edc);
245
INIT_LIST_HEAD(&wa->xfer_list);
246
INIT_LIST_HEAD(&wa->xfer_delayed_list);
247
spin_lock_init(&wa->xfer_list_lock);
248
INIT_WORK(&wa->xfer_work, wa_urb_enqueue_run);
249
atomic_set(&wa->xfer_id_count, 1);
253
* Destroy a pipe (when refcount drops to zero)
255
* Assumes it has been moved to the "QUIESCING" state.
258
extern void rpipe_destroy(struct kref *_rpipe);
260
void __rpipe_get(struct wa_rpipe *rpipe)
262
kref_get(&rpipe->refcnt);
264
extern int rpipe_get_by_ep(struct wahc *, struct usb_host_endpoint *,
265
struct urb *, gfp_t);
266
static inline void rpipe_put(struct wa_rpipe *rpipe)
268
kref_put(&rpipe->refcnt, rpipe_destroy);
271
extern void rpipe_ep_disable(struct wahc *, struct usb_host_endpoint *);
272
extern int wa_rpipes_create(struct wahc *);
273
extern void wa_rpipes_destroy(struct wahc *);
274
static inline void rpipe_avail_dec(struct wa_rpipe *rpipe)
276
atomic_dec(&rpipe->segs_available);
280
* Returns true if the rpipe is ready to submit more segments.
282
static inline int rpipe_avail_inc(struct wa_rpipe *rpipe)
284
return atomic_inc_return(&rpipe->segs_available) > 0
285
&& !list_empty(&rpipe->seg_list);
289
/* Transferring data */
290
extern int wa_urb_enqueue(struct wahc *, struct usb_host_endpoint *,
291
struct urb *, gfp_t);
292
extern int wa_urb_dequeue(struct wahc *, struct urb *);
293
extern void wa_handle_notif_xfer(struct wahc *, struct wa_notif_hdr *);
298
* FIXME: Refcounting for the actual @hwahc object is not correct; I
299
* mean, this should be refcounting on the HCD underneath, but
300
* it is not. In any case, the semantics for HCD refcounting
301
* are *weird*...on refcount reaching zero it just frees
302
* it...no RC specific function is called...unless I miss
305
* FIXME: has to go away in favour of an 'struct' hcd based sollution
307
static inline struct wahc *wa_get(struct wahc *wa)
309
usb_get_intf(wa->usb_iface);
313
static inline void wa_put(struct wahc *wa)
315
usb_put_intf(wa->usb_iface);
319
static inline int __wa_feature(struct wahc *wa, unsigned op, u16 feature)
321
return usb_control_msg(wa->usb_dev, usb_sndctrlpipe(wa->usb_dev, 0),
322
op ? USB_REQ_SET_FEATURE : USB_REQ_CLEAR_FEATURE,
323
USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
325
wa->usb_iface->cur_altsetting->desc.bInterfaceNumber,
326
NULL, 0, 1000 /* FIXME: arbitrary */);
330
static inline int __wa_set_feature(struct wahc *wa, u16 feature)
332
return __wa_feature(wa, 1, feature);
336
static inline int __wa_clear_feature(struct wahc *wa, u16 feature)
338
return __wa_feature(wa, 0, feature);
343
* Return the status of a Wire Adapter
345
* @wa: Wire Adapter instance
346
* @returns < 0 errno code on error, or status bitmap as described
347
* in WUSB1.0[8.3.1.6].
349
* NOTE: need malloc, some arches don't take USB from the stack
352
s32 __wa_get_status(struct wahc *wa)
355
result = usb_control_msg(
356
wa->usb_dev, usb_rcvctrlpipe(wa->usb_dev, 0),
358
USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
359
0, wa->usb_iface->cur_altsetting->desc.bInterfaceNumber,
360
&wa->status, sizeof(wa->status),
361
1000 /* FIXME: arbitrary */);
369
* Waits until the Wire Adapter's status matches @mask/@value
371
* @wa: Wire Adapter instance.
372
* @returns < 0 errno code on error, otherwise status.
374
* Loop until the WAs status matches the mask and value (status & mask
375
* == value). Timeout if it doesn't happen.
377
* FIXME: is there an official specification on how long status
380
static inline s32 __wa_wait_status(struct wahc *wa, u32 mask, u32 value)
386
result = __wa_get_status(wa);
387
if ((result & mask) == value)
393
} while (result >= 0);
398
/** Command @hwahc to stop, @returns 0 if ok, < 0 errno code on error */
399
static inline int __wa_stop(struct wahc *wa)
402
struct device *dev = &wa->usb_iface->dev;
404
result = __wa_clear_feature(wa, WA_ENABLE);
405
if (result < 0 && result != -ENODEV) {
406
dev_err(dev, "error commanding HC to stop: %d\n", result);
409
result = __wa_wait_status(wa, WA_ENABLE, 0);
410
if (result < 0 && result != -ENODEV)
411
dev_err(dev, "error waiting for HC to stop: %d\n", result);
417
#endif /* #ifndef __HWAHC_INTERNAL_H__ */