forked from Minki/linux
265 lines
8.1 KiB
C
265 lines
8.1 KiB
C
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/*
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* Video for Linux Two
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*
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* A generic video device interface for the LINUX operating system
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* using a set of device structures/vectors for low level operations.
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*
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* This file replaces the videodev.c file that comes with the
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* regular kernel distribution.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Author: Bill Dirks <bdirks@pacbell.net>
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* based on code by Alan Cox, <alan@cymru.net>
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*
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*/
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/*
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* Video capture interface for Linux
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*
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* A generic video device interface for the LINUX operating system
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* using a set of device structures/vectors for low level operations.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Author: Alan Cox, <alan@redhat.com>
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*
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* Fixes:
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*/
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/*
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* Video4linux 1/2 integration by Justin Schoeman
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* <justin@suntiger.ee.up.ac.za>
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* 2.4 PROCFS support ported from 2.4 kernels by
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* I<EFBFBD>aki Garc<EFBFBD>a Etxebarria <garetxe@euskalnet.net>
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* Makefile fix by "W. Michael Petullo" <mike@flyn.org>
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* 2.4 devfs support ported from 2.4 kernels by
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* Dan Merillat <dan@merillat.org>
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* Added Gerd Knorrs v4l1 enhancements (Justin Schoeman)
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*/
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#include <linux/config.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/smp_lock.h>
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#include <linux/mm.h>
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#include <linux/string.h>
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#include <linux/errno.h>
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#include <asm/uaccess.h>
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#include <asm/system.h>
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#include <asm/pgtable.h>
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#include <asm/io.h>
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#include <asm/div64.h>
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#ifdef CONFIG_KMOD
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#include <linux/kmod.h>
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#endif
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#if defined(CONFIG_UST) || defined(CONFIG_UST_MODULE)
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#include <linux/ust.h>
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#endif
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#include <linux/videodev.h>
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MODULE_AUTHOR("Bill Dirks, Justin Schoeman, Gerd Knorr");
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MODULE_DESCRIPTION("misc helper functions for v4l2 device drivers");
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MODULE_LICENSE("GPL");
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/*
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*
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* V 4 L 2 D R I V E R H E L P E R A P I
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*
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*/
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/*
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* Video Standard Operations (contributed by Michael Schimek)
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*/
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/* Fill in the fields of a v4l2_standard structure according to the
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'id' and 'transmission' parameters. Returns negative on error. */
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int v4l2_video_std_construct(struct v4l2_standard *vs,
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int id, char *name)
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{
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u32 index = vs->index;
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memset(vs, 0, sizeof(struct v4l2_standard));
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vs->index = index;
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vs->id = id;
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if (id & (V4L2_STD_NTSC | V4L2_STD_PAL_M)) {
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vs->frameperiod.numerator = 1001;
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vs->frameperiod.denominator = 30000;
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vs->framelines = 525;
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} else {
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vs->frameperiod.numerator = 1;
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vs->frameperiod.denominator = 25;
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vs->framelines = 625;
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}
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strlcpy(vs->name,name,sizeof(vs->name));
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return 0;
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}
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/* ----------------------------------------------------------------- */
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/* priority handling */
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#define V4L2_PRIO_VALID(val) (val == V4L2_PRIORITY_BACKGROUND || \
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val == V4L2_PRIORITY_INTERACTIVE || \
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val == V4L2_PRIORITY_RECORD)
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int v4l2_prio_init(struct v4l2_prio_state *global)
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{
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memset(global,0,sizeof(*global));
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return 0;
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}
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int v4l2_prio_change(struct v4l2_prio_state *global, enum v4l2_priority *local,
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enum v4l2_priority new)
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{
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if (!V4L2_PRIO_VALID(new))
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return -EINVAL;
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if (*local == new)
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return 0;
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atomic_inc(&global->prios[new]);
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if (V4L2_PRIO_VALID(*local))
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atomic_dec(&global->prios[*local]);
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*local = new;
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return 0;
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}
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int v4l2_prio_open(struct v4l2_prio_state *global, enum v4l2_priority *local)
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{
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return v4l2_prio_change(global,local,V4L2_PRIORITY_DEFAULT);
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}
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int v4l2_prio_close(struct v4l2_prio_state *global, enum v4l2_priority *local)
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{
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if (V4L2_PRIO_VALID(*local))
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atomic_dec(&global->prios[*local]);
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return 0;
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}
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enum v4l2_priority v4l2_prio_max(struct v4l2_prio_state *global)
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{
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if (atomic_read(&global->prios[V4L2_PRIORITY_RECORD]) > 0)
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return V4L2_PRIORITY_RECORD;
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if (atomic_read(&global->prios[V4L2_PRIORITY_INTERACTIVE]) > 0)
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return V4L2_PRIORITY_INTERACTIVE;
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if (atomic_read(&global->prios[V4L2_PRIORITY_BACKGROUND]) > 0)
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return V4L2_PRIORITY_BACKGROUND;
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return V4L2_PRIORITY_UNSET;
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}
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int v4l2_prio_check(struct v4l2_prio_state *global, enum v4l2_priority *local)
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{
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if (*local < v4l2_prio_max(global))
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return -EBUSY;
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return 0;
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}
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/* ----------------------------------------------------------------- */
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/* some arrays for pretty-printing debug messages */
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char *v4l2_field_names[] = {
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[V4L2_FIELD_ANY] = "any",
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[V4L2_FIELD_NONE] = "none",
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[V4L2_FIELD_TOP] = "top",
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[V4L2_FIELD_BOTTOM] = "bottom",
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[V4L2_FIELD_INTERLACED] = "interlaced",
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[V4L2_FIELD_SEQ_TB] = "seq-tb",
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[V4L2_FIELD_SEQ_BT] = "seq-bt",
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[V4L2_FIELD_ALTERNATE] = "alternate",
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};
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char *v4l2_type_names[] = {
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[V4L2_BUF_TYPE_VIDEO_CAPTURE] = "video-cap",
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[V4L2_BUF_TYPE_VIDEO_OVERLAY] = "video-over",
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[V4L2_BUF_TYPE_VIDEO_OUTPUT] = "video-out",
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[V4L2_BUF_TYPE_VBI_CAPTURE] = "vbi-cap",
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[V4L2_BUF_TYPE_VBI_OUTPUT] = "vbi-out",
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};
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char *v4l2_ioctl_names[256] = {
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#if __GNUC__ >= 3
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[0 ... 255] = "UNKNOWN",
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#endif
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[_IOC_NR(VIDIOC_QUERYCAP)] = "VIDIOC_QUERYCAP",
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[_IOC_NR(VIDIOC_RESERVED)] = "VIDIOC_RESERVED",
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[_IOC_NR(VIDIOC_ENUM_FMT)] = "VIDIOC_ENUM_FMT",
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[_IOC_NR(VIDIOC_G_FMT)] = "VIDIOC_G_FMT",
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[_IOC_NR(VIDIOC_S_FMT)] = "VIDIOC_S_FMT",
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[_IOC_NR(VIDIOC_REQBUFS)] = "VIDIOC_REQBUFS",
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[_IOC_NR(VIDIOC_QUERYBUF)] = "VIDIOC_QUERYBUF",
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[_IOC_NR(VIDIOC_G_FBUF)] = "VIDIOC_G_FBUF",
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[_IOC_NR(VIDIOC_S_FBUF)] = "VIDIOC_S_FBUF",
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[_IOC_NR(VIDIOC_OVERLAY)] = "VIDIOC_OVERLAY",
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[_IOC_NR(VIDIOC_QBUF)] = "VIDIOC_QBUF",
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[_IOC_NR(VIDIOC_DQBUF)] = "VIDIOC_DQBUF",
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[_IOC_NR(VIDIOC_STREAMON)] = "VIDIOC_STREAMON",
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[_IOC_NR(VIDIOC_STREAMOFF)] = "VIDIOC_STREAMOFF",
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[_IOC_NR(VIDIOC_G_PARM)] = "VIDIOC_G_PARM",
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[_IOC_NR(VIDIOC_S_PARM)] = "VIDIOC_S_PARM",
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[_IOC_NR(VIDIOC_G_STD)] = "VIDIOC_G_STD",
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[_IOC_NR(VIDIOC_S_STD)] = "VIDIOC_S_STD",
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[_IOC_NR(VIDIOC_ENUMSTD)] = "VIDIOC_ENUMSTD",
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[_IOC_NR(VIDIOC_ENUMINPUT)] = "VIDIOC_ENUMINPUT",
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[_IOC_NR(VIDIOC_G_CTRL)] = "VIDIOC_G_CTRL",
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[_IOC_NR(VIDIOC_S_CTRL)] = "VIDIOC_S_CTRL",
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[_IOC_NR(VIDIOC_G_TUNER)] = "VIDIOC_G_TUNER",
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[_IOC_NR(VIDIOC_S_TUNER)] = "VIDIOC_S_TUNER",
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[_IOC_NR(VIDIOC_G_AUDIO)] = "VIDIOC_G_AUDIO",
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[_IOC_NR(VIDIOC_S_AUDIO)] = "VIDIOC_S_AUDIO",
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[_IOC_NR(VIDIOC_QUERYCTRL)] = "VIDIOC_QUERYCTRL",
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[_IOC_NR(VIDIOC_QUERYMENU)] = "VIDIOC_QUERYMENU",
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[_IOC_NR(VIDIOC_G_INPUT)] = "VIDIOC_G_INPUT",
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[_IOC_NR(VIDIOC_S_INPUT)] = "VIDIOC_S_INPUT",
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[_IOC_NR(VIDIOC_G_OUTPUT)] = "VIDIOC_G_OUTPUT",
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[_IOC_NR(VIDIOC_S_OUTPUT)] = "VIDIOC_S_OUTPUT",
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[_IOC_NR(VIDIOC_ENUMOUTPUT)] = "VIDIOC_ENUMOUTPUT",
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[_IOC_NR(VIDIOC_G_AUDOUT)] = "VIDIOC_G_AUDOUT",
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[_IOC_NR(VIDIOC_S_AUDOUT)] = "VIDIOC_S_AUDOUT",
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[_IOC_NR(VIDIOC_G_MODULATOR)] = "VIDIOC_G_MODULATOR",
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[_IOC_NR(VIDIOC_S_MODULATOR)] = "VIDIOC_S_MODULATOR",
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[_IOC_NR(VIDIOC_G_FREQUENCY)] = "VIDIOC_G_FREQUENCY",
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[_IOC_NR(VIDIOC_S_FREQUENCY)] = "VIDIOC_S_FREQUENCY",
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[_IOC_NR(VIDIOC_CROPCAP)] = "VIDIOC_CROPCAP",
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[_IOC_NR(VIDIOC_G_CROP)] = "VIDIOC_G_CROP",
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[_IOC_NR(VIDIOC_S_CROP)] = "VIDIOC_S_CROP",
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[_IOC_NR(VIDIOC_G_JPEGCOMP)] = "VIDIOC_G_JPEGCOMP",
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[_IOC_NR(VIDIOC_S_JPEGCOMP)] = "VIDIOC_S_JPEGCOMP",
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[_IOC_NR(VIDIOC_QUERYSTD)] = "VIDIOC_QUERYSTD",
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[_IOC_NR(VIDIOC_TRY_FMT)] = "VIDIOC_TRY_FMT",
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};
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/* ----------------------------------------------------------------- */
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EXPORT_SYMBOL(v4l2_video_std_construct);
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EXPORT_SYMBOL(v4l2_prio_init);
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EXPORT_SYMBOL(v4l2_prio_change);
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EXPORT_SYMBOL(v4l2_prio_open);
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EXPORT_SYMBOL(v4l2_prio_close);
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EXPORT_SYMBOL(v4l2_prio_max);
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EXPORT_SYMBOL(v4l2_prio_check);
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EXPORT_SYMBOL(v4l2_field_names);
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EXPORT_SYMBOL(v4l2_type_names);
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EXPORT_SYMBOL(v4l2_ioctl_names);
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/*
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* Local variables:
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* c-basic-offset: 8
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* End:
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*/
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