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/*
* VoiceBus(tm) Interface Library.
*
* Written by Shaun Ruffell <sruffell@digium.com>
* and based on previous work by Mark Spencer <markster@digium.com>,
* Matthew Fredrickson <creslin@digium.com>, and
* Michael Spiceland <mspiceland@digium.com>
*
* Copyright (C) 2007-2010 Digium, Inc.
*
* All rights reserved.
*
*/
/*
* See http://www.asterisk.org for more information about
* the Asterisk project. Please do not directly contact
* any of the maintainers of this project for assistance;
* the project provides a web site, mailing lists and IRC
* channels for your use.
*
* This program is free software, distributed under the terms of
* the GNU General Public License Version 2 as published by the
* Free Software Foundation. See the LICENSE file included with
* this program for more details.
*/
#ifndef __VOICEBUS_H__
#define __VOICEBUS_H__
#include <linux/interrupt.h>
#define VOICEBUS_DEFAULT_LATENCY 3
#define VOICEBUS_DEFAULT_MAXLATENCY 25
#define VOICEBUS_MAXLATENCY_BUMP 6
#define VOICEBUS_SFRAME_SIZE 1004
/*! The number of descriptors in both the tx and rx descriptor ring. */
#define DRING_SIZE (1 << 7) /* Must be a power of 2 */
#define DRING_MASK (DRING_SIZE-1)
/* Define CONFIG_VOICEBUS_SYSFS to create some attributes under the pci device.
* This is disabled by default because it hasn't been tested on the full range
* of supported kernels. */
#define CONFIG_VOICEBUS_SYSFS
/* Do not generate interrupts on this interface, but instead just poll it */
#undef CONFIG_VOICEBUS_TIMER
struct voicebus;
struct vbb {
u8 data[VOICEBUS_SFRAME_SIZE];
struct list_head entry;
};
struct voicebus_operations {
void (*handle_receive)(struct voicebus *vb, struct list_head *buffers);
void (*handle_transmit)(struct voicebus *vb, struct list_head *buffers);
void (*handle_error)(struct voicebus *vb);
};
/**
* struct voicebus_descriptor_list - A single descriptor list.
*/
struct voicebus_descriptor_list {
struct voicebus_descriptor *desc;
unsigned int head;
unsigned int tail;
void *pending[DRING_SIZE];
dma_addr_t desc_dma;
atomic_t count;
unsigned int padding;
};
/**
* struct voicebus - Represents physical interface to voicebus card.
*
* @tx_complete: only used in the tasklet to temporarily hold complete tx
* buffers.
*/
struct voicebus {
struct pci_dev *pdev;
spinlock_t lock;
struct voicebus_descriptor_list rxd;
struct voicebus_descriptor_list txd;
u8 *idle_vbb;
dma_addr_t idle_vbb_dma_addr;
const int *debug;
u32 iobase;
struct tasklet_struct tasklet;
#if defined(CONFIG_VOICEBUS_TIMER)
struct timer_list timer;
#endif
struct work_struct underrun_work;
const struct voicebus_operations *ops;
struct completion stopped_completion;
unsigned long flags;
unsigned int min_tx_buffer_count;
unsigned int max_latency;
struct list_head tx_complete;
};
int voicebus_init(struct voicebus *vb, const char *board_name);
void voicebus_release(struct voicebus *vb);
int voicebus_start(struct voicebus *vb);
int voicebus_stop(struct voicebus *vb);
void voicebus_free(struct voicebus *vb, struct vbb *vbb);
int voicebus_transmit(struct voicebus *vb, struct vbb *vbb);
int voicebus_set_minlatency(struct voicebus *vb, unsigned int milliseconds);
int voicebus_current_latency(struct voicebus *vb);
void voicebus_lock_latency(struct voicebus *vb);
void voicebus_unlock_latency(struct voicebus *vb);
int voicebus_is_latency_locked(const struct voicebus *vb);
#endif /* __VOICEBUS_H__ */
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