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linux-next/drivers/uwb/uwb-internal.h
Thomas Pugliese a899575191 USB: HWA: fix device probe failure 
This patch fixes a race condition that caused the HWA_HC interface probe
function to occasionally fail.  The HWA_HC would attempt to register
itself with the HWA_RC by searching for a uwb_rc class device with the
same parent device ptr.  If the probe function for the HWA_RC interface
had yet to run, the uwb_rc class device would not have been created
causing the look up to fail and the HWA_HC probe function to return an
error causing the device to be unusable.

The fix is for the HWA to delay registering with the HWA_RC until
receiving the command from userspace to start the wireless channel.  It
is the responsibility of userspace to ensure that the uwb_rc class
device has been created before starting the HWA channel.

Signed-off-by: Thomas Pugliese <thomas.pugliese@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-06-24 16:20:43 -07:00

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/*
* Ultra Wide Band
* UWB internal API
*
* 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 contains most of the internal API for UWB. This is stuff used
* across the stack that of course, is of no interest to the rest.
*
* Some parts might end up going public (like uwb_rc_*())...
*/
#ifndef __UWB_INTERNAL_H__
#define __UWB_INTERNAL_H__
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/uwb.h>
#include <linux/mutex.h>
struct uwb_beca_e;
/* General device API */
extern void uwb_dev_init(struct uwb_dev *uwb_dev);
extern int __uwb_dev_offair(struct uwb_dev *, struct uwb_rc *);
extern int uwb_dev_add(struct uwb_dev *uwb_dev, struct device *parent_dev,
struct uwb_rc *parent_rc);
extern void uwb_dev_rm(struct uwb_dev *uwb_dev);
extern void uwbd_dev_onair(struct uwb_rc *, struct uwb_beca_e *);
extern void uwbd_dev_offair(struct uwb_beca_e *);
void uwb_notify(struct uwb_rc *rc, struct uwb_dev *uwb_dev, enum uwb_notifs event);
/* General UWB Radio Controller Internal API */
extern struct uwb_rc *__uwb_rc_try_get(struct uwb_rc *);
static inline struct uwb_rc *__uwb_rc_get(struct uwb_rc *rc)
{
uwb_dev_get(&rc->uwb_dev);
return rc;
}
static inline void __uwb_rc_put(struct uwb_rc *rc)
{
if (rc)
uwb_dev_put(&rc->uwb_dev);
}
extern int uwb_rc_reset(struct uwb_rc *rc);
extern int uwb_rc_beacon(struct uwb_rc *rc,
int channel, unsigned bpst_offset);
extern int uwb_rc_scan(struct uwb_rc *rc,
unsigned channel, enum uwb_scan_type type,
unsigned bpst_offset);
extern int uwb_rc_send_all_drp_ie(struct uwb_rc *rc);
void uwb_rc_ie_init(struct uwb_rc *);
int uwb_rc_ie_setup(struct uwb_rc *);
void uwb_rc_ie_release(struct uwb_rc *);
int uwb_ie_dump_hex(const struct uwb_ie_hdr *ies, size_t len,
char *buf, size_t size);
int uwb_rc_set_ie(struct uwb_rc *, struct uwb_rc_cmd_set_ie *);
extern const char *uwb_rc_strerror(unsigned code);
/*
* Time to wait for a response to an RC command.
*
* Some commands can take a long time to response. e.g., START_BEACON
* may scan for several superframes before joining an existing beacon
* group and this can take around 600 ms.
*/
#define UWB_RC_CMD_TIMEOUT_MS 1000 /* ms */
/*
* Notification/Event Handlers
*/
struct uwb_rc_neh;
extern int uwb_rc_cmd_async(struct uwb_rc *rc, const char *cmd_name,
struct uwb_rccb *cmd, size_t cmd_size,
u8 expected_type, u16 expected_event,
uwb_rc_cmd_cb_f cb, void *arg);
void uwb_rc_neh_create(struct uwb_rc *rc);
void uwb_rc_neh_destroy(struct uwb_rc *rc);
struct uwb_rc_neh *uwb_rc_neh_add(struct uwb_rc *rc, struct uwb_rccb *cmd,
u8 expected_type, u16 expected_event,
uwb_rc_cmd_cb_f cb, void *arg);
void uwb_rc_neh_rm(struct uwb_rc *rc, struct uwb_rc_neh *neh);
void uwb_rc_neh_arm(struct uwb_rc *rc, struct uwb_rc_neh *neh);
void uwb_rc_neh_put(struct uwb_rc_neh *neh);
/* Event size tables */
extern int uwb_est_create(void);
extern void uwb_est_destroy(void);
/*
* UWB conflicting alien reservations
*/
struct uwb_cnflt_alien {
struct uwb_rc *rc;
struct list_head rc_node;
struct uwb_mas_bm mas;
struct timer_list timer;
struct work_struct cnflt_update_work;
};
enum uwb_uwb_rsv_alloc_result {
UWB_RSV_ALLOC_FOUND = 0,
UWB_RSV_ALLOC_NOT_FOUND,
};
enum uwb_rsv_mas_status {
UWB_RSV_MAS_NOT_AVAIL = 1,
UWB_RSV_MAS_SAFE,
UWB_RSV_MAS_UNSAFE,
};
struct uwb_rsv_col_set_info {
unsigned char start_col;
unsigned char interval;
unsigned char safe_mas_per_col;
unsigned char unsafe_mas_per_col;
};
struct uwb_rsv_col_info {
unsigned char max_avail_safe;
unsigned char max_avail_unsafe;
unsigned char highest_mas[UWB_MAS_PER_ZONE];
struct uwb_rsv_col_set_info csi;
};
struct uwb_rsv_row_info {
unsigned char avail[UWB_MAS_PER_ZONE];
unsigned char free_rows;
unsigned char used_rows;
};
/*
* UWB find allocation
*/
struct uwb_rsv_alloc_info {
unsigned char bm[UWB_MAS_PER_ZONE * UWB_NUM_ZONES];
struct uwb_rsv_col_info ci[UWB_NUM_ZONES];
struct uwb_rsv_row_info ri;
struct uwb_mas_bm *not_available;
struct uwb_mas_bm *result;
int min_mas;
int max_mas;
int max_interval;
int total_allocated_mases;
int safe_allocated_mases;
int unsafe_allocated_mases;
int interval;
};
int uwb_rsv_find_best_allocation(struct uwb_rsv *rsv, struct uwb_mas_bm *available,
struct uwb_mas_bm *result);
void uwb_rsv_handle_drp_avail_change(struct uwb_rc *rc);
/*
* UWB Events & management daemon
*/
/**
* enum uwb_event_type - types of UWB management daemon events
*
* The UWB management daemon (uwbd) can receive two types of events:
* UWB_EVT_TYPE_NOTIF - notification from the radio controller.
* UWB_EVT_TYPE_MSG - a simple message.
*/
enum uwb_event_type {
UWB_EVT_TYPE_NOTIF,
UWB_EVT_TYPE_MSG,
};
/**
* struct uwb_event_notif - an event for a radio controller notification
* @size: Size of the buffer (ie: Guaranteed to contain at least
* a full 'struct uwb_rceb')
* @rceb: Pointer to a kmalloced() event payload
*/
struct uwb_event_notif {
size_t size;
struct uwb_rceb *rceb;
};
/**
* enum uwb_event_message - an event for a message for asynchronous processing
*
* UWB_EVT_MSG_RESET - reset the radio controller and all PAL hardware.
*/
enum uwb_event_message {
UWB_EVT_MSG_RESET,
};
/**
* UWB Event
* @rc: Radio controller that emitted the event (referenced)
* @ts_jiffies: Timestamp, when was it received
* @type: This event's type.
*/
struct uwb_event {
struct list_head list_node;
struct uwb_rc *rc;
unsigned long ts_jiffies;
enum uwb_event_type type;
union {
struct uwb_event_notif notif;
enum uwb_event_message message;
};
};
extern void uwbd_start(struct uwb_rc *rc);
extern void uwbd_stop(struct uwb_rc *rc);
extern struct uwb_event *uwb_event_alloc(size_t, gfp_t gfp_mask);
extern void uwbd_event_queue(struct uwb_event *);
void uwbd_flush(struct uwb_rc *rc);
/* UWB event handlers */
extern int uwbd_evt_handle_rc_ie_rcv(struct uwb_event *);
extern int uwbd_evt_handle_rc_beacon(struct uwb_event *);
extern int uwbd_evt_handle_rc_beacon_size(struct uwb_event *);
extern int uwbd_evt_handle_rc_bpoie_change(struct uwb_event *);
extern int uwbd_evt_handle_rc_bp_slot_change(struct uwb_event *);
extern int uwbd_evt_handle_rc_drp(struct uwb_event *);
extern int uwbd_evt_handle_rc_drp_avail(struct uwb_event *);
int uwbd_msg_handle_reset(struct uwb_event *evt);
/*
* Address management
*/
int uwb_rc_dev_addr_assign(struct uwb_rc *rc);
int uwbd_evt_handle_rc_dev_addr_conflict(struct uwb_event *evt);
/*
* UWB Beacon Cache
*
* Each beacon we received is kept in a cache--when we receive that
* beacon consistently, that means there is a new device that we have
* to add to the system.
*/
extern unsigned long beacon_timeout_ms;
/**
* Beacon cache entry
*
* @jiffies_refresh: last time a beacon was received that refreshed
* this cache entry.
* @uwb_dev: device connected to this beacon. This pointer is not
* safe, you need to get it with uwb_dev_try_get()
*
* @hits: how many time we have seen this beacon since last time we
* cleared it
*/
struct uwb_beca_e {
struct mutex mutex;
struct kref refcnt;
struct list_head node;
struct uwb_mac_addr *mac_addr;
struct uwb_dev_addr dev_addr;
u8 hits;
unsigned long ts_jiffies;
struct uwb_dev *uwb_dev;
struct uwb_rc_evt_beacon *be;
struct stats lqe_stats, rssi_stats; /* radio statistics */
};
struct uwb_beacon_frame;
extern ssize_t uwb_bce_print_IEs(struct uwb_dev *, struct uwb_beca_e *,
char *, size_t);
extern void uwb_bce_kfree(struct kref *_bce);
static inline void uwb_bce_get(struct uwb_beca_e *bce)
{
kref_get(&bce->refcnt);
}
static inline void uwb_bce_put(struct uwb_beca_e *bce)
{
kref_put(&bce->refcnt, uwb_bce_kfree);
}
extern void uwb_beca_purge(struct uwb_rc *rc);
extern void uwb_beca_release(struct uwb_rc *rc);
struct uwb_dev *uwb_dev_get_by_devaddr(struct uwb_rc *rc,
const struct uwb_dev_addr *devaddr);
struct uwb_dev *uwb_dev_get_by_macaddr(struct uwb_rc *rc,
const struct uwb_mac_addr *macaddr);
int uwb_radio_setup(struct uwb_rc *rc);
void uwb_radio_reset_state(struct uwb_rc *rc);
void uwb_radio_shutdown(struct uwb_rc *rc);
int uwb_radio_force_channel(struct uwb_rc *rc, int channel);
/* -- UWB Sysfs representation */
extern struct class uwb_rc_class;
extern struct device_attribute dev_attr_mac_address;
extern struct device_attribute dev_attr_beacon;
extern struct device_attribute dev_attr_scan;
/* -- DRP Bandwidth allocator: bandwidth allocations, reservations, DRP */
void uwb_rsv_init(struct uwb_rc *rc);
int uwb_rsv_setup(struct uwb_rc *rc);
void uwb_rsv_cleanup(struct uwb_rc *rc);
void uwb_rsv_remove_all(struct uwb_rc *rc);
void uwb_rsv_get(struct uwb_rsv *rsv);
void uwb_rsv_put(struct uwb_rsv *rsv);
bool uwb_rsv_has_two_drp_ies(struct uwb_rsv *rsv);
void uwb_rsv_dump(char *text, struct uwb_rsv *rsv);
int uwb_rsv_try_move(struct uwb_rsv *rsv, struct uwb_mas_bm *available);
void uwb_rsv_backoff_win_timer(unsigned long arg);
void uwb_rsv_backoff_win_increment(struct uwb_rc *rc);
int uwb_rsv_status(struct uwb_rsv *rsv);
int uwb_rsv_companion_status(struct uwb_rsv *rsv);
void uwb_rsv_set_state(struct uwb_rsv *rsv, enum uwb_rsv_state new_state);
void uwb_rsv_remove(struct uwb_rsv *rsv);
struct uwb_rsv *uwb_rsv_find(struct uwb_rc *rc, struct uwb_dev *src,
struct uwb_ie_drp *drp_ie);
void uwb_rsv_sched_update(struct uwb_rc *rc);
void uwb_rsv_queue_update(struct uwb_rc *rc);
int uwb_drp_ie_update(struct uwb_rsv *rsv);
void uwb_drp_ie_to_bm(struct uwb_mas_bm *bm, const struct uwb_ie_drp *drp_ie);
void uwb_drp_avail_init(struct uwb_rc *rc);
void uwb_drp_available(struct uwb_rc *rc, struct uwb_mas_bm *avail);
int uwb_drp_avail_reserve_pending(struct uwb_rc *rc, struct uwb_mas_bm *mas);
void uwb_drp_avail_reserve(struct uwb_rc *rc, struct uwb_mas_bm *mas);
void uwb_drp_avail_release(struct uwb_rc *rc, struct uwb_mas_bm *mas);
void uwb_drp_avail_ie_update(struct uwb_rc *rc);
/* -- PAL support */
void uwb_rc_pal_init(struct uwb_rc *rc);
/* -- Misc */
extern ssize_t uwb_mac_frame_hdr_print(char *, size_t,
const struct uwb_mac_frame_hdr *);
/* -- Debug interface */
void uwb_dbg_init(void);
void uwb_dbg_exit(void);
void uwb_dbg_add_rc(struct uwb_rc *rc);
void uwb_dbg_del_rc(struct uwb_rc *rc);
struct dentry *uwb_dbg_create_pal_dir(struct uwb_pal *pal);
static inline void uwb_dev_lock(struct uwb_dev *uwb_dev)
{
device_lock(&uwb_dev->dev);
}
static inline void uwb_dev_unlock(struct uwb_dev *uwb_dev)
{
device_unlock(&uwb_dev->dev);
}
#endif /* #ifndef __UWB_INTERNAL_H__ */
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