cregit-Linux how code gets into the kernel

Release 4.7 drivers/media/pci/cx18/cx18-alsa.h

/*
 *  ALSA interface to cx18 PCM capture streams
 *
 *  Copyright (C) 2009  Andy Walls <awalls@md.metrocast.net>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
 *  02111-1307  USA
 */

struct snd_card;


struct snd_cx18_card {
	
struct v4l2_device *v4l2_dev;
	
struct snd_card *sc;
	
unsigned int capture_transfer_done;
	
unsigned int hwptr_done_capture;
	
struct snd_pcm_substream *capture_pcm_substream;
	
spinlock_t slock;
};

extern int cx18_alsa_debug;

/*
 * File operations that manipulate the encoder or video or audio subdevices
 * need to be serialized.  Use the same lock we use for v4l2 file ops.
 */

static inline void snd_cx18_lock(struct snd_cx18_card *cxsc) { struct cx18 *cx = to_cx18(cxsc->v4l2_dev); mutex_lock(&cx->serialize_lock); }

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static inline void snd_cx18_unlock(struct snd_cx18_card *cxsc) { struct cx18 *cx = to_cx18(cxsc->v4l2_dev); mutex_unlock(&cx->serialize_lock); }

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#define CX18_ALSA_DBGFLG_WARN (1 << 0) #define CX18_ALSA_DBGFLG_INFO (1 << 1) #define CX18_ALSA_DEBUG(x, type, fmt, args...) \ do { \ if ((x) & cx18_alsa_debug) \ printk(KERN_INFO "%s-alsa: " type ": " fmt, \ v4l2_dev->name , ## args); \ } while (0) #define CX18_ALSA_DEBUG_WARN(fmt, args...) \ CX18_ALSA_DEBUG(CX18_ALSA_DBGFLG_WARN, "warning", fmt , ## args) #define CX18_ALSA_DEBUG_INFO(fmt, args...) \ CX18_ALSA_DEBUG(CX18_ALSA_DBGFLG_INFO, "info", fmt , ## args) #define CX18_ALSA_ERR(fmt, args...) \ printk(KERN_ERR "%s-alsa: " fmt, v4l2_dev->name , ## args) #define CX18_ALSA_WARN(fmt, args...) \ printk(KERN_WARNING "%s-alsa: " fmt, v4l2_dev->name , ## args) #define CX18_ALSA_INFO(fmt, args...) \ printk(KERN_INFO "%s-alsa: " fmt, v4l2_dev->name , ## args)

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