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/*
* notify_driver.c
*
* Syslink driver support for OMAP Processors.
*
* Copyright (C) 2008-2009 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.
*/
#include <linux/spinlock.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/uaccess.h>
#include <linux/io.h>
#include <asm/pgtable.h>
#include <syslink/gt.h>
#include <syslink/notify.h>
#include <syslink/notify_driver.h>
#include <syslink/atomic_linux.h>
/*
*func notify_register_driver
*
*desc This function registers a Notify driver with the Notify module.
*/
int notify_register_driver(char *driver_name,
struct notify_interface *fn_table,
struct notify_driver_attrs *drv_attrs,
struct notify_driver_object **driver_handle)
{
int status = NOTIFY_SUCCESS;
struct notify_driver_object *drv_handle = NULL;
int i;
BUG_ON(driver_name == NULL);
BUG_ON(fn_table == NULL);
BUG_ON(drv_attrs == NULL);
BUG_ON(driver_handle == NULL);
if (atomic_cmpmask_and_lt(&(notify_state.ref_count),
NOTIFY_MAKE_MAGICSTAMP(0),
NOTIFY_MAKE_MAGICSTAMP(1)) == true) {
status = NOTIFY_E_INVALIDSTATE;
goto func_end;
}
/*Initialize to status that indicates that an empty slot was not
*found for the driver.
*/
if (mutex_lock_interruptible(notify_state.gate_handle) != 0)
WARN_ON(1);
status = NOTIFY_E_MAXDRIVERS;
for (i = 0; i < notify_state.cfg.maxDrivers; i++) {
drv_handle = &(notify_state.drivers[i]);
if (drv_handle->is_init == NOTIFY_DRIVERINITSTATUS_DONE) {
if (strncmp(driver_name, drv_handle->name,
NOTIFY_MAX_NAMELEN) == 0) {
status = NOTIFY_E_ALREADYEXISTS;
goto return_existing_handle;
}
}
if (drv_handle->is_init == NOTIFY_DRIVERINITSTATUS_NOTDONE) {
/* Found an empty slot, so block it. */
drv_handle->is_init =
NOTIFY_DRIVERINITSTATUS_INPROGRESS;
status = NOTIFY_SUCCESS;
break;
}
}
mutex_unlock(notify_state.gate_handle);
WARN_ON(status < 0);
/*Complete registration of the driver. */
strncpy(drv_handle->name,
driver_name, NOTIFY_MAX_NAMELEN);
memcpy(&(drv_handle->attrs), drv_attrs,
sizeof(struct notify_driver_attrs));
memcpy(&(drv_handle->fn_table), fn_table,
sizeof(struct notify_interface));
drv_handle->driver_object = NULL;
return_existing_handle:
/*is_setup is set when driverInit is called. */
*driver_handle = drv_handle;
func_end:
return status;
}
EXPORT_SYMBOL(notify_register_driver);
/*========================================
*func notify_unregister_driver
*
*desc This function un-registers a Notify driver with the Notify module.
*/
int notify_unregister_driver(struct notify_driver_object *drv_handle)
{
int status = NOTIFY_SUCCESS;
BUG_ON(drv_handle == NULL);
if (atomic_cmpmask_and_lt(&(notify_state.ref_count),
NOTIFY_MAKE_MAGICSTAMP(0),
NOTIFY_MAKE_MAGICSTAMP(1)) == true) {
status = NOTIFY_E_INVALIDSTATE;
} else {
/* Unregister the driver. */
drv_handle->is_init = NOTIFY_DRIVERINITSTATUS_NOTDONE;
}
return status;
}
EXPORT_SYMBOL(notify_unregister_driver);
/*==================================
* Function to find and return the driver handle maintained within
* the Notify module.
*
* driver_name Name of the driver to be searched.
* handle Return parameter: Handle to the driver.
*
*/
int notify_get_driver_handle(char *driver_name,
struct notify_driver_object **handle)
{
int status = NOTIFY_E_NOTFOUND;
struct notify_driver_object *drv_handle;
int i;
BUG_ON(handle == NULL);
if (atomic_cmpmask_and_lt(&(notify_state.ref_count),
NOTIFY_MAKE_MAGICSTAMP(0),
NOTIFY_MAKE_MAGICSTAMP(1)) == true) {
status = NOTIFY_E_INVALIDSTATE;
} else if (WARN_ON(driver_name == NULL))
status = NOTIFY_E_INVALIDARG;
else {
if (mutex_lock_interruptible(notify_state.gate_handle) != 0)
WARN_ON(1);
for (i = 0; i < notify_state.cfg.maxDrivers; i++) {
drv_handle = &(notify_state.drivers[i]);
/* Check whether the driver handle slot is occupied. */
if (drv_handle->is_init == true) {
if (strncmp(driver_name, drv_handle->name,
NOTIFY_MAX_NAMELEN) == 0) {
status = NOTIFY_SUCCESS;
*handle = drv_handle;
break;
}
}
}
mutex_unlock(notify_state.gate_handle);
}
return status;
}
EXPORT_SYMBOL(notify_get_driver_handle);
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