linux/drivers/media/usb/stk1160/stk1160-video.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * STK1160 driver
 *
 * Copyright (C) 2012 Ezequiel Garcia
 * <elezegarcia--a.t--gmail.com>
 *
 * Based on Easycap driver by R.M. Thomas
 *	Copyright (C) 2010 R.M. Thomas
 *	<rmthomas--a.t--sciolus.org>
 */

#include <linux/module.h>
#include <linux/usb.h>
#include <linux/slab.h>
#include <linux/ratelimit.h>

#include "stk1160.h"

static unsigned int debug;
module_param(debug, int, 0644);
MODULE_PARM_DESC(…) …;

static inline void print_err_status(struct stk1160 *dev,
				     int packet, int status)
{ … }

static inline
struct stk1160_buffer *stk1160_next_buffer(struct stk1160 *dev)
{ … }

static inline
void stk1160_buffer_done(struct stk1160 *dev)
{ … }

static inline
void stk1160_copy_video(struct stk1160 *dev, u8 *src, int len)
{ … }

/*
 * Controls the isoc copy of each urb packet
 */
static void stk1160_process_isoc(struct stk1160 *dev, struct urb *urb)
{ … }


/*
 * IRQ callback, called by URB callback
 */
static void stk1160_isoc_irq(struct urb *urb)
{ … }

/*
 * Cancel urbs
 * This function can't be called in atomic context
 */
void stk1160_cancel_isoc(struct stk1160 *dev)
{ … }

static void stk_free_urb(struct stk1160 *dev, struct stk1160_urb *stk_urb)
{ … }

/*
 * Releases urb and transfer buffers
 * Obviusly, associated urb must be killed before releasing it.
 */
void stk1160_free_isoc(struct stk1160 *dev)
{ … }

/*
 * Helper for cancelling and freeing urbs
 * This function can't be called in atomic context
 */
void stk1160_uninit_isoc(struct stk1160 *dev)
{ … }

static int stk1160_fill_urb(struct stk1160 *dev, struct stk1160_urb *stk_urb,
			    int sb_size, int max_packets)
{ … }
/*
 * Allocate URBs
 */
int stk1160_alloc_isoc(struct stk1160 *dev)
{ … }