diff options
Diffstat (limited to 'drivers/staging/tidspbridge/include/dspbridge/ntfy.h')
| -rw-r--r-- | drivers/staging/tidspbridge/include/dspbridge/ntfy.h | 217 |
1 files changed, 217 insertions, 0 deletions
diff --git a/drivers/staging/tidspbridge/include/dspbridge/ntfy.h b/drivers/staging/tidspbridge/include/dspbridge/ntfy.h new file mode 100644 index 000000000000..cbc8819c61cc --- /dev/null +++ b/drivers/staging/tidspbridge/include/dspbridge/ntfy.h @@ -0,0 +1,217 @@ +/* + * ntfy.h + * + * DSP-BIOS Bridge driver support functions for TI OMAP processors. + * + * Manage lists of notification events. + * + * Copyright (C) 2005-2006 Texas Instruments, Inc. + * + * This package 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 PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED + * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. + */ + +#ifndef NTFY_ +#define NTFY_ + +#include <dspbridge/host_os.h> +#include <dspbridge/dbdefs.h> +#include <dspbridge/sync.h> + +/** + * ntfy_object - head structure to nofify dspbridge events + * @head: List of notify objects + * @ntfy_lock: lock for list access. + * + */ +struct ntfy_object { + struct raw_notifier_head head;/* List of notifier objects */ + spinlock_t ntfy_lock; /* For critical sections */ +}; + +/** + * ntfy_event - structure store specify event to be notified + * @noti_block: List of notify objects + * @event: event that it respond + * @type: event type (only DSP_SIGNALEVENT supported) + * @sync_obj: sync_event used to set the event + * + */ +struct ntfy_event { + struct notifier_block noti_block; + u32 event; /* Events to be notified about */ + u32 type; /* Type of notification to be sent */ + struct sync_object sync_obj; +}; + + +/** + * dsp_notifier_event() - callback function to nofity events + * @this: pointer to itself struct notifier_block + * @event: event to be notified. + * @data: Currently not used. + * + */ +int dsp_notifier_event(struct notifier_block *this, unsigned long event, + void *data); + +/** + * ntfy_init() - Set the initial state of the ntfy_object structure. + * @no: pointer to ntfy_object structure. + * + * This function sets the initial state of the ntfy_object in order it + * can be used by the other ntfy functions. + */ + +static inline void ntfy_init(struct ntfy_object *no) +{ + spin_lock_init(&no->ntfy_lock); + RAW_INIT_NOTIFIER_HEAD(&no->head); +} + +/** + * ntfy_delete() - delete list of nofy events registered. + * @ntfy_obj: Pointer to the ntfy object structure. + * + * This function is used to remove all the notify events registered. + * unregister function is not needed in this function, to unregister + * a ntfy_event please look at ntfy_register function. + * + */ +static inline void ntfy_delete(struct ntfy_object *ntfy_obj) +{ + struct ntfy_event *ne; + struct notifier_block *nb; + + spin_lock_bh(&ntfy_obj->ntfy_lock); + nb = ntfy_obj->head.head; + while (nb) { + ne = container_of(nb, struct ntfy_event, noti_block); + nb = nb->next; + kfree(ne); + } + spin_unlock_bh(&ntfy_obj->ntfy_lock); +} + +/** + * ntfy_notify() - nofity all event register for an specific event. + * @ntfy_obj: Pointer to the ntfy_object structure. + * @event: event to be notified. + * + * This function traverses all the ntfy events registers and + * set the event with mach with @event. + */ +static inline void ntfy_notify(struct ntfy_object *ntfy_obj, u32 event) +{ + spin_lock_bh(&ntfy_obj->ntfy_lock); + raw_notifier_call_chain(&ntfy_obj->head, event, NULL); + spin_unlock_bh(&ntfy_obj->ntfy_lock); +} + + + +/** + * ntfy_init() - Create and initialize a ntfy_event structure. + * @event: event that the ntfy event will respond + * @type event type (only DSP_SIGNALEVENT supported) + * + * This function create a ntfy_event element and sets the event it will + * respond the ntfy_event in order it can be used by the other ntfy functions. + * In case of success it will return a pointer to the ntfy_event struct + * created. Otherwise it will return NULL; + */ + +static inline struct ntfy_event *ntfy_event_create(u32 event, u32 type) +{ + struct ntfy_event *ne; + ne = kmalloc(sizeof(struct ntfy_event), GFP_KERNEL); + if (ne) { + sync_init_event(&ne->sync_obj); + ne->noti_block.notifier_call = dsp_notifier_event; + ne->event = event; + ne->type = type; + } + return ne; +} + +/** + * ntfy_register() - register new ntfy_event into a given ntfy_object + * @ntfy_obj: Pointer to the ntfy_object structure. + * @noti: Pointer to the handle to be returned to the user space. + * @event event that the ntfy event will respond + * @type event type (only DSP_SIGNALEVENT supported) + * + * This function register a new ntfy_event into the ntfy_object list, + * which will respond to the @event passed. + * This function will return 0 in case of error. + * -EFAULT in case of bad pointers and + * DSP_EMemory in case of no memory to create ntfy_event. + */ +static inline int ntfy_register(struct ntfy_object *ntfy_obj, + struct dsp_notification *noti, + u32 event, u32 type) +{ + struct ntfy_event *ne; + int status = 0; + + if (!noti || !ntfy_obj) { + status = -EFAULT; + goto func_end; + } + if (!event) { + status = -EINVAL; + goto func_end; + } + ne = ntfy_event_create(event, type); + if (!ne) { + status = -ENOMEM; + goto func_end; + } + noti->handle = &ne->sync_obj; + + spin_lock_bh(&ntfy_obj->ntfy_lock); + raw_notifier_chain_register(&ntfy_obj->head, &ne->noti_block); + spin_unlock_bh(&ntfy_obj->ntfy_lock); +func_end: + return status; +} + +/** + * ntfy_unregister() - unregister a ntfy_event from a given ntfy_object + * @ntfy_obj: Pointer to the ntfy_object structure. + * @noti: Pointer to the event that will be removed. + * + * This function unregister a ntfy_event from the ntfy_object list, + * @noti contains the event which is wanted to be removed. + * This function will return 0 in case of error. + * -EFAULT in case of bad pointers and + * DSP_EMemory in case of no memory to create ntfy_event. + */ +static inline int ntfy_unregister(struct ntfy_object *ntfy_obj, + struct dsp_notification *noti) +{ + int status = 0; + struct ntfy_event *ne; + + if (!noti || !ntfy_obj) { + status = -EFAULT; + goto func_end; + } + + ne = container_of((struct sync_object *)noti, struct ntfy_event, + sync_obj); + spin_lock_bh(&ntfy_obj->ntfy_lock); + raw_notifier_chain_unregister(&ntfy_obj->head, + &ne->noti_block); + kfree(ne); + spin_unlock_bh(&ntfy_obj->ntfy_lock); +func_end: + return status; +} + +#endif /* NTFY_ */ |