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* Copyright (c) 2010-2012 Broadcom. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions, and the following disclaimer,
* without modification.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The names of the above-listed copyright holders may not be used
* to endorse or promote products derived from this software without
* specific prior written permission.
*
* ALTERNATIVELY, this software may be distributed under the terms of the
* GNU General Public License ("GPL") version 2, as published by the Free
* Software Foundation.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <linux/module.h>
#include <linux/types.h>
#include "interface/vchi/vchi.h"
#include "vchiq.h"
#include "vchiq_core.h"
#include "vchiq_util.h"
#define vchiq_status_to_vchi(status) ((int32_t)status)
struct shim_service {
VCHIQ_SERVICE_HANDLE_T handle;
VCHIU_QUEUE_T queue;
VCHI_CALLBACK_T callback;
void *callback_param;
};
/* ----------------------------------------------------------------------
* return pointer to the mphi message driver function table
* -------------------------------------------------------------------- */
const VCHI_MESSAGE_DRIVER_T *
vchi_mphi_message_driver_func_table(void)
{
return NULL;
}
/* ----------------------------------------------------------------------
* return a pointer to the 'single' connection driver fops
* -------------------------------------------------------------------- */
const VCHI_CONNECTION_API_T *
single_get_func_table(void)
{
return NULL;
}
VCHI_CONNECTION_T *vchi_create_connection(
const VCHI_CONNECTION_API_T *function_table,
const VCHI_MESSAGE_DRIVER_T *low_level)
{
(void)function_table;
(void)low_level;
return NULL;
}
/***********************************************************
* Name: vchi_msg_peek
*
* Arguments: const VCHI_SERVICE_HANDLE_T handle,
* void **data,
* uint32_t *msg_size,
* VCHI_FLAGS_T flags
*
* Description: Routine to return a pointer to the current message (to allow in
* place processing). The message can be removed using
* vchi_msg_remove when you're finished
*
* Returns: int32_t - success == 0
*
***********************************************************/
int32_t vchi_msg_peek(VCHI_SERVICE_HANDLE_T handle,
void **data,
uint32_t *msg_size,
VCHI_FLAGS_T flags)
{
struct shim_service *service = (struct shim_service *)handle;
VCHIQ_HEADER_T *header;
WARN_ON((flags != VCHI_FLAGS_NONE) &&
(flags != VCHI_FLAGS_BLOCK_UNTIL_OP_COMPLETE));
if (flags == VCHI_FLAGS_NONE)
if (vchiu_queue_is_empty(&service->queue))
return -1;
header = vchiu_queue_peek(&service->queue);
*data = header->data;
*msg_size = header->size;
return 0;
}
EXPORT_SYMBOL(vchi_msg_peek);
/***********************************************************
* Name: vchi_msg_remove
*
* Arguments: const VCHI_SERVICE_HANDLE_T handle,
*
* Description: Routine to remove a message (after it has been read with
* vchi_msg_peek)
*
* Returns: int32_t - success == 0
*
***********************************************************/
int32_t vchi_msg_remove(VCHI_SERVICE_HANDLE_T handle)
{
struct shim_service *service = (struct shim_service *)handle;
VCHIQ_HEADER_T *header;
header = vchiu_queue_pop(&service->queue);
vchiq_release_message(service->handle, header);
return 0;
}
EXPORT_SYMBOL(vchi_msg_remove);
/***********************************************************
* Name: vchi_msg_queue
*
* Arguments: VCHI_SERVICE_HANDLE_T handle,
* ssize_t (*copy_callback)(void *context, void *dest,
* size_t offset, size_t maxsize),
* void *context,
* uint32_t data_size
*
* Description: Thin wrapper to queue a message onto a connection
*
* Returns: int32_t - success == 0
*
***********************************************************/
static
int32_t vchi_msg_queue(VCHI_SERVICE_HANDLE_T handle,
ssize_t (*copy_callback)(void *context, void *dest,
size_t offset, size_t maxsize),
void *context,
uint32_t data_size)
{
struct shim_service *service = (struct shim_service *)handle;
VCHIQ_STATUS_T status;
while (1) {
status = vchiq_queue_message(service->handle,
copy_callback,
context,
data_size);
/*
* vchiq_queue_message() may return VCHIQ_RETRY, so we need to
* implement a retry mechanism since this function is supposed
* to block until queued
*/
if (status != VCHIQ_RETRY)
break;
msleep(1);
}
return vchiq_status_to_vchi(status);
}
static ssize_t
vchi_queue_kernel_message_callback(void *context,
void *dest,
size_t offset,
size_t maxsize)
{
memcpy(dest, context + offset, maxsize);
return maxsize;
}
int
vchi_queue_kernel_message(VCHI_SERVICE_HANDLE_T handle,
void *data,
unsigned int size)
{
return vchi_msg_queue(handle,
vchi_queue_kernel_message_callback,
data,
size);
}
EXPORT_SYMBOL(vchi_queue_kernel_message);
struct vchi_queue_user_message_context {
void __user *data;
};
static ssize_t
vchi_queue_user_message_callback(void *context,
void *dest,
size_t offset,
size_t maxsize)
{
struct vchi_queue_user_message_context *copycontext = context;
if (copy_from_user(dest, copycontext->data + offset, maxsize))
return -EFAULT;
return maxsize;
}
int
vchi_queue_user_message(VCHI_SERVICE_HANDLE_T handle,
void __user *data,
unsigned int size)
{
struct vchi_queue_user_message_context copycontext = {
.data = data
};
return vchi_msg_queue(handle,
vchi_queue_user_message_callback,
©context,
size);
}
EXPORT_SYMBOL(vchi_queue_user_message);
/***********************************************************
* Name: vchi_bulk_queue_receive
*
* Arguments: VCHI_BULK_HANDLE_T handle,
* void *data_dst,
* const uint32_t data_size,
* VCHI_FLAGS_T flags
* void *bulk_handle
*
* Description: Routine to setup a rcv buffer
*
* Returns: int32_t - success == 0
*
***********************************************************/
int32_t vchi_bulk_queue_receive(VCHI_SERVICE_HANDLE_T handle,
void *data_dst,
uint32_t data_size,
VCHI_FLAGS_T flags,
void *bulk_handle)
{
struct shim_service *service = (struct shim_service *)handle;
VCHIQ_BULK_MODE_T mode;
VCHIQ_STATUS_T status;
switch ((int)flags) {
case VCHI_FLAGS_CALLBACK_WHEN_OP_COMPLETE
| VCHI_FLAGS_BLOCK_UNTIL_QUEUED:
WARN_ON(!service->callback);
mode = VCHIQ_BULK_MODE_CALLBACK;
break;
case VCHI_FLAGS_BLOCK_UNTIL_OP_COMPLETE:
mode = VCHIQ_BULK_MODE_BLOCKING;
break;
case VCHI_FLAGS_BLOCK_UNTIL_QUEUED:
case VCHI_FLAGS_NONE:
mode = VCHIQ_BULK_MODE_NOCALLBACK;
break;
default:
WARN(1, "unsupported message\n");
return vchiq_status_to_vchi(VCHIQ_ERROR);
}
while (1) {
status = vchiq_bulk_receive(service->handle, data_dst,
data_size, bulk_handle, mode);
/*
* vchiq_bulk_receive() may return VCHIQ_RETRY, so we need to
* implement a retry mechanism since this function is supposed
* to block until queued
*/
if (status != VCHIQ_RETRY)
break;
msleep(1);
}
return vchiq_status_to_vchi(status);
}
EXPORT_SYMBOL(vchi_bulk_queue_receive);
/***********************************************************
* Name: vchi_bulk_queue_transmit
*
* Arguments: VCHI_BULK_HANDLE_T handle,
* const void *data_src,
* uint32_t data_size,
* VCHI_FLAGS_T flags,
* void *bulk_handle
*
* Description: Routine to transmit some data
*
* Returns: int32_t - success == 0
*
***********************************************************/
int32_t vchi_bulk_queue_transmit(VCHI_SERVICE_HANDLE_T handle,
const void *data_src,
uint32_t data_size,
VCHI_FLAGS_T flags,
void *bulk_handle)
{
struct shim_service *service = (struct shim_service *)handle;
VCHIQ_BULK_MODE_T mode;
VCHIQ_STATUS_T status;
switch ((int)flags) {
case VCHI_FLAGS_CALLBACK_WHEN_OP_COMPLETE
| VCHI_FLAGS_BLOCK_UNTIL_QUEUED:
WARN_ON(!service->callback);
mode = VCHIQ_BULK_MODE_CALLBACK;
break;
case VCHI_FLAGS_BLOCK_UNTIL_DATA_READ:
case VCHI_FLAGS_BLOCK_UNTIL_OP_COMPLETE:
mode = VCHIQ_BULK_MODE_BLOCKING;
break;
case VCHI_FLAGS_BLOCK_UNTIL_QUEUED:
case VCHI_FLAGS_NONE:
mode = VCHIQ_BULK_MODE_NOCALLBACK;
break;
default:
WARN(1, "unsupported message\n");
return vchiq_status_to_vchi(VCHIQ_ERROR);
}
while (1) {
status = vchiq_bulk_transmit(service->handle, data_src,
data_size, bulk_handle, mode);
/*
* vchiq_bulk_transmit() may return VCHIQ_RETRY, so we need to
* implement a retry mechanism since this function is supposed
* to block until queued
*/
if (status != VCHIQ_RETRY)
break;
msleep(1);
}
return vchiq_status_to_vchi(status);
}
EXPORT_SYMBOL(vchi_bulk_queue_transmit);
/***********************************************************
* Name: vchi_msg_dequeue
*
* Arguments: VCHI_SERVICE_HANDLE_T handle,
* void *data,
* uint32_t max_data_size_to_read,
* uint32_t *actual_msg_size
* VCHI_FLAGS_T flags
*
* Description: Routine to dequeue a message into the supplied buffer
*
* Returns: int32_t - success == 0
*
***********************************************************/
int32_t vchi_msg_dequeue(VCHI_SERVICE_HANDLE_T handle,
void *data,
uint32_t max_data_size_to_read,
uint32_t *actual_msg_size,
VCHI_FLAGS_T flags)
{
struct shim_service *service = (struct shim_service *)handle;
VCHIQ_HEADER_T *header;
WARN_ON((flags != VCHI_FLAGS_NONE) &&
(flags != VCHI_FLAGS_BLOCK_UNTIL_OP_COMPLETE));
if (flags == VCHI_FLAGS_NONE)
if (vchiu_queue_is_empty(&service->queue))
return -1;
header = vchiu_queue_pop(&service->queue);
memcpy(data, header->data, header->size < max_data_size_to_read ?
header->size : max_data_size_to_read);
*actual_msg_size = header->size;
vchiq_release_message(service->handle, header);
return 0;
}
EXPORT_SYMBOL(vchi_msg_dequeue);
/***********************************************************
* Name: vchi_held_msg_release
*
* Arguments: VCHI_HELD_MSG_T *message
*
* Description: Routine to release a held message (after it has been read with
* vchi_msg_hold)
*
* Returns: int32_t - success == 0
*
***********************************************************/
int32_t vchi_held_msg_release(VCHI_HELD_MSG_T *message)
{
/*
* Convert the service field pointer back to an
* VCHIQ_SERVICE_HANDLE_T which is an int.
* This pointer is opaque to everything except
* vchi_msg_hold which simply upcasted the int
* to a pointer.
*/
vchiq_release_message((VCHIQ_SERVICE_HANDLE_T)(long)message->service,
(VCHIQ_HEADER_T *)message->message);
return 0;
}
EXPORT_SYMBOL(vchi_held_msg_release);
/***********************************************************
* Name: vchi_msg_hold
*
* Arguments: VCHI_SERVICE_HANDLE_T handle,
* void **data,
* uint32_t *msg_size,
* VCHI_FLAGS_T flags,
* VCHI_HELD_MSG_T *message_handle
*
* Description: Routine to return a pointer to the current message (to allow
* in place processing). The message is dequeued - don't forget
* to release the message using vchi_held_msg_release when you're
* finished.
*
* Returns: int32_t - success == 0
*
***********************************************************/
int32_t vchi_msg_hold(VCHI_SERVICE_HANDLE_T handle,
void **data,
uint32_t *msg_size,
VCHI_FLAGS_T flags,
VCHI_HELD_MSG_T *message_handle)
{
struct shim_service *service = (struct shim_service *)handle;
VCHIQ_HEADER_T *header;
WARN_ON((flags != VCHI_FLAGS_NONE) &&
(flags != VCHI_FLAGS_BLOCK_UNTIL_OP_COMPLETE));
if (flags == VCHI_FLAGS_NONE)
if (vchiu_queue_is_empty(&service->queue))
return -1;
header = vchiu_queue_pop(&service->queue);
*data = header->data;
*msg_size = header->size;
/*
* upcast the VCHIQ_SERVICE_HANDLE_T which is an int
* to a pointer and stuff it in the held message.
* This pointer is opaque to everything except
* vchi_held_msg_release which simply downcasts it back
* to an int.
*/
message_handle->service =
(struct opaque_vchi_service_t *)(long)service->handle;
message_handle->message = header;
return 0;
}
EXPORT_SYMBOL(vchi_msg_hold);
/***********************************************************
* Name: vchi_initialise
*
* Arguments: VCHI_INSTANCE_T *instance_handle
*
* Description: Initialises the hardware but does not transmit anything
* When run as a Host App this will be called twice hence the need
* to malloc the state information
*
* Returns: 0 if successful, failure otherwise
*
***********************************************************/
int32_t vchi_initialise(VCHI_INSTANCE_T *instance_handle)
{
VCHIQ_INSTANCE_T instance;
VCHIQ_STATUS_T status;
status = vchiq_initialise(&instance);
*instance_handle = (VCHI_INSTANCE_T)instance;
return vchiq_status_to_vchi(status);
}
EXPORT_SYMBOL(vchi_initialise);
/***********************************************************
* Name: vchi_connect
*
* Arguments: VCHI_CONNECTION_T **connections
* const uint32_t num_connections
* VCHI_INSTANCE_T instance_handle)
*
* Description: Starts the command service on each connection,
* causing INIT messages to be pinged back and forth
*
* Returns: 0 if successful, failure otherwise
*
***********************************************************/
int32_t vchi_connect(VCHI_CONNECTION_T **connections,
const uint32_t num_connections,
VCHI_INSTANCE_T instance_handle)
{
VCHIQ_INSTANCE_T instance = (VCHIQ_INSTANCE_T)instance_handle;
(void)connections;
(void)num_connections;
return vchiq_connect(instance);
}
EXPORT_SYMBOL(vchi_connect);
/***********************************************************
* Name: vchi_disconnect
*
* Arguments: VCHI_INSTANCE_T instance_handle
*
* Description: Stops the command service on each connection,
* causing DE-INIT messages to be pinged back and forth
*
* Returns: 0 if successful, failure otherwise
*
***********************************************************/
int32_t vchi_disconnect(VCHI_INSTANCE_T instance_handle)
{
VCHIQ_INSTANCE_T instance = (VCHIQ_INSTANCE_T)instance_handle;
return vchiq_status_to_vchi(vchiq_shutdown(instance));
}
EXPORT_SYMBOL(vchi_disconnect);
/***********************************************************
* Name: vchi_service_open
* Name: vchi_service_create
*
* Arguments: VCHI_INSTANCE_T *instance_handle
* SERVICE_CREATION_T *setup,
* VCHI_SERVICE_HANDLE_T *handle
*
* Description: Routine to open a service
*
* Returns: int32_t - success == 0
*
***********************************************************/
static VCHIQ_STATUS_T shim_callback(VCHIQ_REASON_T reason,
VCHIQ_HEADER_T *header, VCHIQ_SERVICE_HANDLE_T handle, void *bulk_user)
{
struct shim_service *service =
(struct shim_service *)VCHIQ_GET_SERVICE_USERDATA(handle);
if (!service->callback)
goto release;
switch (reason) {
case VCHIQ_MESSAGE_AVAILABLE:
vchiu_queue_push(&service->queue, header);
service->callback(service->callback_param,
VCHI_CALLBACK_MSG_AVAILABLE, NULL);
goto done;
break;
case VCHIQ_BULK_TRANSMIT_DONE:
service->callback(service->callback_param,
VCHI_CALLBACK_BULK_SENT, bulk_user);
break;
case VCHIQ_BULK_RECEIVE_DONE:
service->callback(service->callback_param,
VCHI_CALLBACK_BULK_RECEIVED, bulk_user);
break;
case VCHIQ_SERVICE_CLOSED:
service->callback(service->callback_param,
VCHI_CALLBACK_SERVICE_CLOSED, NULL);
break;
case VCHIQ_SERVICE_OPENED:
/* No equivalent VCHI reason */
break;
case VCHIQ_BULK_TRANSMIT_ABORTED:
service->callback(service->callback_param,
VCHI_CALLBACK_BULK_TRANSMIT_ABORTED,
bulk_user);
break;
case VCHIQ_BULK_RECEIVE_ABORTED:
service->callback(service->callback_param,
VCHI_CALLBACK_BULK_RECEIVE_ABORTED,
bulk_user);
break;
default:
WARN(1, "not supported\n");
break;
}
release:
vchiq_release_message(service->handle, header);
done:
return VCHIQ_SUCCESS;
}
static struct shim_service *service_alloc(VCHIQ_INSTANCE_T instance,
SERVICE_CREATION_T *setup)
{
struct shim_service *service = kzalloc(sizeof(struct shim_service), GFP_KERNEL);
(void)instance;
if (service) {
if (vchiu_queue_init(&service->queue, 64)) {
service->callback = setup->callback;
service->callback_param = setup->callback_param;
} else {
kfree(service);
service = NULL;
}
}
return service;
}
static void service_free(struct shim_service *service)
{
if (service) {
vchiu_queue_delete(&service->queue);
kfree(service);
}
}
int32_t vchi_service_open(VCHI_INSTANCE_T instance_handle,
SERVICE_CREATION_T *setup,
VCHI_SERVICE_HANDLE_T *handle)
{
VCHIQ_INSTANCE_T instance = (VCHIQ_INSTANCE_T)instance_handle;
struct shim_service *service = service_alloc(instance, setup);
*handle = (VCHI_SERVICE_HANDLE_T)service;
if (service) {
VCHIQ_SERVICE_PARAMS_T params;
VCHIQ_STATUS_T status;
memset(¶ms, 0, sizeof(params));
params.fourcc = setup->service_id;
params.callback = shim_callback;
params.userdata = service;
params.version = setup->version.version;
params.version_min = setup->version.version_min;
status = vchiq_open_service(instance, ¶ms,
&service->handle);
if (status != VCHIQ_SUCCESS) {
service_free(service);
service = NULL;
*handle = NULL;
}
}
return (service != NULL) ? 0 : -1;
}
EXPORT_SYMBOL(vchi_service_open);
int32_t vchi_service_create(VCHI_INSTANCE_T instance_handle,
SERVICE_CREATION_T *setup,
VCHI_SERVICE_HANDLE_T *handle)
{
VCHIQ_INSTANCE_T instance = (VCHIQ_INSTANCE_T)instance_handle;
struct shim_service *service = service_alloc(instance, setup);
*handle = (VCHI_SERVICE_HANDLE_T)service;
if (service) {
VCHIQ_SERVICE_PARAMS_T params;
VCHIQ_STATUS_T status;
memset(¶ms, 0, sizeof(params));
params.fourcc = setup->service_id;
params.callback = shim_callback;
params.userdata = service;
params.version = setup->version.version;
params.version_min = setup->version.version_min;
status = vchiq_add_service(instance, ¶ms, &service->handle);
if (status != VCHIQ_SUCCESS) {
service_free(service);
service = NULL;
*handle = NULL;
}
}
return (service != NULL) ? 0 : -1;
}
EXPORT_SYMBOL(vchi_service_create);
int32_t vchi_service_close(const VCHI_SERVICE_HANDLE_T handle)
{
int32_t ret = -1;
struct shim_service *service = (struct shim_service *)handle;
if (service) {
VCHIQ_STATUS_T status = vchiq_close_service(service->handle);
if (status == VCHIQ_SUCCESS) {
service_free(service);
service = NULL;
}
ret = vchiq_status_to_vchi(status);
}
return ret;
}
EXPORT_SYMBOL(vchi_service_close);
int32_t vchi_service_destroy(const VCHI_SERVICE_HANDLE_T handle)
{
int32_t ret = -1;
struct shim_service *service = (struct shim_service *)handle;
if (service) {
VCHIQ_STATUS_T status = vchiq_remove_service(service->handle);
if (status == VCHIQ_SUCCESS) {
service_free(service);
service = NULL;
}
ret = vchiq_status_to_vchi(status);
}
return ret;
}
EXPORT_SYMBOL(vchi_service_destroy);
int32_t vchi_service_set_option(const VCHI_SERVICE_HANDLE_T handle,
VCHI_SERVICE_OPTION_T option,
int value)
{
int32_t ret = -1;
struct shim_service *service = (struct shim_service *)handle;
VCHIQ_SERVICE_OPTION_T vchiq_option;
switch (option) {
case VCHI_SERVICE_OPTION_TRACE:
vchiq_option = VCHIQ_SERVICE_OPTION_TRACE;
break;
case VCHI_SERVICE_OPTION_SYNCHRONOUS:
vchiq_option = VCHIQ_SERVICE_OPTION_SYNCHRONOUS;
break;
default:
service = NULL;
break;
}
if (service) {
VCHIQ_STATUS_T status =
vchiq_set_service_option(service->handle,
vchiq_option,
value);
ret = vchiq_status_to_vchi(status);
}
return ret;
}
EXPORT_SYMBOL(vchi_service_set_option);
int32_t vchi_get_peer_version(const VCHI_SERVICE_HANDLE_T handle, short *peer_version)
{
int32_t ret = -1;
struct shim_service *service = (struct shim_service *)handle;
if (service)
{
VCHIQ_STATUS_T status;
status = vchiq_get_peer_version(service->handle, peer_version);
ret = vchiq_status_to_vchi(status);
}
return ret;
}
EXPORT_SYMBOL(vchi_get_peer_version);
/***********************************************************
* Name: vchi_service_use
*
* Arguments: const VCHI_SERVICE_HANDLE_T handle
*
* Description: Routine to increment refcount on a service
*
* Returns: void
*
***********************************************************/
int32_t vchi_service_use(const VCHI_SERVICE_HANDLE_T handle)
{
int32_t ret = -1;
struct shim_service *service = (struct shim_service *)handle;
if (service)
ret = vchiq_status_to_vchi(vchiq_use_service(service->handle));
return ret;
}
EXPORT_SYMBOL(vchi_service_use);
/***********************************************************
* Name: vchi_service_release
*
* Arguments: const VCHI_SERVICE_HANDLE_T handle
*
* Description: Routine to decrement refcount on a service
*
* Returns: void
*
***********************************************************/
int32_t vchi_service_release(const VCHI_SERVICE_HANDLE_T handle)
{
int32_t ret = -1;
struct shim_service *service = (struct shim_service *)handle;
if (service)
ret = vchiq_status_to_vchi(
vchiq_release_service(service->handle));
return ret;
}
EXPORT_SYMBOL(vchi_service_release);
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