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linux/drivers/uwb/uwb-internal.h
Greg Kroah-Hartman 8e9394ce24 Driver core: create lock/unlock functions for struct device 
In the future, we are going to be changing the lock type for struct
device (once we get the lockdep infrastructure properly worked out)  To
make that changeover easier, and to possibly burry the lock in a
different part of struct device, let's create some functions to lock and
unlock a device so that no out-of-core code needs to be changed in the
future.

This patch creates the device_lock/unlock/trylock() functions, and
converts all in-tree users to them.

Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Jean Delvare <khali@linux-fr.org>
Cc: Dave Young <hidave.darkstar@gmail.com>
Cc: Ming Lei <tom.leiming@gmail.com>
Cc: Jiri Kosina <jkosina@suse.cz>
Cc: Phil Carmody <ext-phil.2.carmody@nokia.com>
Cc: Arjan van de Ven <arjan@linux.intel.com>
Cc: Cornelia Huck <cornelia.huck@de.ibm.com>
Cc: Rafael J. Wysocki <rjw@sisk.pl>
Cc: Pavel Machek <pavel@ucw.cz>
Cc: Len Brown <len.brown@intel.com>
Cc: Magnus Damm <damm@igel.co.jp>
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: Randy Dunlap <randy.dunlap@oracle.com>
Cc: Stefan Richter <stefanr@s5r6.in-berlin.de>
Cc: David Brownell <dbrownell@users.sourceforge.net>
Cc: Vegard Nossum <vegard.nossum@gmail.com>
Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
Cc: Alex Chiang <achiang@hp.com>
Cc: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andrew Patterson <andrew.patterson@hp.com>
Cc: Yu Zhao <yu.zhao@intel.com>
Cc: Dominik Brodowski <linux@dominikbrodowski.net>
Cc: Samuel Ortiz <sameo@linux.intel.com>
Cc: Wolfram Sang <w.sang@pengutronix.de>
Cc: CHENG Renquan <rqcheng@smu.edu.sg>
Cc: Oliver Neukum <oliver@neukum.org>
Cc: Frans Pop <elendil@planet.nl>
Cc: David Vrabel <david.vrabel@csr.com>
Cc: Kay Sievers <kay.sievers@vrfy.org>
Cc: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2010-03-07 17:04:52 -08:00

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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/version.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)
{
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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