From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sat, 16 Apr 2005 15:20:36 -0700 Subject: Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip! --- drivers/media/video/v4l2-common.c | 282 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 282 insertions(+) create mode 100644 drivers/media/video/v4l2-common.c (limited to 'drivers/media/video/v4l2-common.c') diff --git a/drivers/media/video/v4l2-common.c b/drivers/media/video/v4l2-common.c new file mode 100644 index 00000000000..b5e0cf3448f --- /dev/null +++ b/drivers/media/video/v4l2-common.c @@ -0,0 +1,282 @@ +/* + * Video for Linux Two + * + * A generic video device interface for the LINUX operating system + * using a set of device structures/vectors for low level operations. + * + * This file replaces the videodev.c file that comes with the + * regular kernel distribution. + * + * 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. + * + * Author: Bill Dirks + * based on code by Alan Cox, + * + */ + +/* + * Video capture interface for Linux + * + * A generic video device interface for the LINUX operating system + * using a set of device structures/vectors for low level operations. + * + * 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. + * + * Author: Alan Cox, + * + * Fixes: + */ + +/* + * Video4linux 1/2 integration by Justin Schoeman + * + * 2.4 PROCFS support ported from 2.4 kernels by + * Iñaki García Etxebarria + * Makefile fix by "W. Michael Petullo" + * 2.4 devfs support ported from 2.4 kernels by + * Dan Merillat + * Added Gerd Knorrs v4l1 enhancements (Justin Schoeman) + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#ifdef CONFIG_KMOD +#include +#endif + +#if defined(CONFIG_UST) || defined(CONFIG_UST_MODULE) +#include +#endif + + +#include + +MODULE_AUTHOR("Bill Dirks, Justin Schoeman, Gerd Knorr"); +MODULE_DESCRIPTION("misc helper functions for v4l2 device drivers"); +MODULE_LICENSE("GPL"); + +/* + * + * V 4 L 2 D R I V E R H E L P E R A P I + * + */ + +/* + * Video Standard Operations (contributed by Michael Schimek) + */ + +#if 0 /* seems to have no users */ +/* This is the recommended method to deal with the framerate fields. More + sophisticated drivers will access the fields directly. */ +unsigned int +v4l2_video_std_fps(struct v4l2_standard *vs) +{ + if (vs->frameperiod.numerator > 0) + return (((vs->frameperiod.denominator << 8) / + vs->frameperiod.numerator) + + (1 << 7)) / (1 << 8); + return 0; +} +EXPORT_SYMBOL(v4l2_video_std_fps); +#endif + +/* Fill in the fields of a v4l2_standard structure according to the + 'id' and 'transmission' parameters. Returns negative on error. */ +int v4l2_video_std_construct(struct v4l2_standard *vs, + int id, char *name) +{ + u32 index = vs->index; + + memset(vs, 0, sizeof(struct v4l2_standard)); + vs->index = index; + vs->id = id; + if (id & (V4L2_STD_NTSC | V4L2_STD_PAL_M)) { + vs->frameperiod.numerator = 1001; + vs->frameperiod.denominator = 30000; + vs->framelines = 525; + } else { + vs->frameperiod.numerator = 1; + vs->frameperiod.denominator = 25; + vs->framelines = 625; + } + strlcpy(vs->name,name,sizeof(vs->name)); + return 0; +} + + +/* ----------------------------------------------------------------- */ +/* priority handling */ + +#define V4L2_PRIO_VALID(val) (val == V4L2_PRIORITY_BACKGROUND || \ + val == V4L2_PRIORITY_INTERACTIVE || \ + val == V4L2_PRIORITY_RECORD) + +int v4l2_prio_init(struct v4l2_prio_state *global) +{ + memset(global,0,sizeof(*global)); + return 0; +} + +int v4l2_prio_change(struct v4l2_prio_state *global, enum v4l2_priority *local, + enum v4l2_priority new) +{ + if (!V4L2_PRIO_VALID(new)) + return -EINVAL; + if (*local == new) + return 0; + + atomic_inc(&global->prios[new]); + if (V4L2_PRIO_VALID(*local)) + atomic_dec(&global->prios[*local]); + *local = new; + return 0; +} + +int v4l2_prio_open(struct v4l2_prio_state *global, enum v4l2_priority *local) +{ + return v4l2_prio_change(global,local,V4L2_PRIORITY_DEFAULT); +} + +int v4l2_prio_close(struct v4l2_prio_state *global, enum v4l2_priority *local) +{ + if (V4L2_PRIO_VALID(*local)) + atomic_dec(&global->prios[*local]); + return 0; +} + +enum v4l2_priority v4l2_prio_max(struct v4l2_prio_state *global) +{ + if (atomic_read(&global->prios[V4L2_PRIORITY_RECORD]) > 0) + return V4L2_PRIORITY_RECORD; + if (atomic_read(&global->prios[V4L2_PRIORITY_INTERACTIVE]) > 0) + return V4L2_PRIORITY_INTERACTIVE; + if (atomic_read(&global->prios[V4L2_PRIORITY_BACKGROUND]) > 0) + return V4L2_PRIORITY_BACKGROUND; + return V4L2_PRIORITY_UNSET; +} + +int v4l2_prio_check(struct v4l2_prio_state *global, enum v4l2_priority *local) +{ + if (*local < v4l2_prio_max(global)) + return -EBUSY; + return 0; +} + + +/* ----------------------------------------------------------------- */ +/* some arrays for pretty-printing debug messages */ + +char *v4l2_field_names[] = { + [V4L2_FIELD_ANY] = "any", + [V4L2_FIELD_NONE] = "none", + [V4L2_FIELD_TOP] = "top", + [V4L2_FIELD_BOTTOM] = "bottom", + [V4L2_FIELD_INTERLACED] = "interlaced", + [V4L2_FIELD_SEQ_TB] = "seq-tb", + [V4L2_FIELD_SEQ_BT] = "seq-bt", + [V4L2_FIELD_ALTERNATE] = "alternate", +}; + +char *v4l2_type_names[] = { + [V4L2_BUF_TYPE_VIDEO_CAPTURE] = "video-cap", + [V4L2_BUF_TYPE_VIDEO_OVERLAY] = "video-over", + [V4L2_BUF_TYPE_VIDEO_OUTPUT] = "video-out", + [V4L2_BUF_TYPE_VBI_CAPTURE] = "vbi-cap", + [V4L2_BUF_TYPE_VBI_OUTPUT] = "vbi-out", +}; + +char *v4l2_ioctl_names[256] = { +#if __GNUC__ >= 3 + [0 ... 255] = "UNKNOWN", +#endif + [_IOC_NR(VIDIOC_QUERYCAP)] = "VIDIOC_QUERYCAP", + [_IOC_NR(VIDIOC_RESERVED)] = "VIDIOC_RESERVED", + [_IOC_NR(VIDIOC_ENUM_FMT)] = "VIDIOC_ENUM_FMT", + [_IOC_NR(VIDIOC_G_FMT)] = "VIDIOC_G_FMT", + [_IOC_NR(VIDIOC_S_FMT)] = "VIDIOC_S_FMT", +#if 0 + [_IOC_NR(VIDIOC_G_COMP)] = "VIDIOC_G_COMP", + [_IOC_NR(VIDIOC_S_COMP)] = "VIDIOC_S_COMP", +#endif + [_IOC_NR(VIDIOC_REQBUFS)] = "VIDIOC_REQBUFS", + [_IOC_NR(VIDIOC_QUERYBUF)] = "VIDIOC_QUERYBUF", + [_IOC_NR(VIDIOC_G_FBUF)] = "VIDIOC_G_FBUF", + [_IOC_NR(VIDIOC_S_FBUF)] = "VIDIOC_S_FBUF", + [_IOC_NR(VIDIOC_OVERLAY)] = "VIDIOC_OVERLAY", + [_IOC_NR(VIDIOC_QBUF)] = "VIDIOC_QBUF", + [_IOC_NR(VIDIOC_DQBUF)] = "VIDIOC_DQBUF", + [_IOC_NR(VIDIOC_STREAMON)] = "VIDIOC_STREAMON", + [_IOC_NR(VIDIOC_STREAMOFF)] = "VIDIOC_STREAMOFF", + [_IOC_NR(VIDIOC_G_PARM)] = "VIDIOC_G_PARM", + [_IOC_NR(VIDIOC_S_PARM)] = "VIDIOC_S_PARM", + [_IOC_NR(VIDIOC_G_STD)] = "VIDIOC_G_STD", + [_IOC_NR(VIDIOC_S_STD)] = "VIDIOC_S_STD", + [_IOC_NR(VIDIOC_ENUMSTD)] = "VIDIOC_ENUMSTD", + [_IOC_NR(VIDIOC_ENUMINPUT)] = "VIDIOC_ENUMINPUT", + [_IOC_NR(VIDIOC_G_CTRL)] = "VIDIOC_G_CTRL", + [_IOC_NR(VIDIOC_S_CTRL)] = "VIDIOC_S_CTRL", + [_IOC_NR(VIDIOC_G_TUNER)] = "VIDIOC_G_TUNER", + [_IOC_NR(VIDIOC_S_TUNER)] = "VIDIOC_S_TUNER", + [_IOC_NR(VIDIOC_G_AUDIO)] = "VIDIOC_G_AUDIO", + [_IOC_NR(VIDIOC_S_AUDIO)] = "VIDIOC_S_AUDIO", + [_IOC_NR(VIDIOC_QUERYCTRL)] = "VIDIOC_QUERYCTRL", + [_IOC_NR(VIDIOC_QUERYMENU)] = "VIDIOC_QUERYMENU", + [_IOC_NR(VIDIOC_G_INPUT)] = "VIDIOC_G_INPUT", + [_IOC_NR(VIDIOC_S_INPUT)] = "VIDIOC_S_INPUT", + [_IOC_NR(VIDIOC_G_OUTPUT)] = "VIDIOC_G_OUTPUT", + [_IOC_NR(VIDIOC_S_OUTPUT)] = "VIDIOC_S_OUTPUT", + [_IOC_NR(VIDIOC_ENUMOUTPUT)] = "VIDIOC_ENUMOUTPUT", + [_IOC_NR(VIDIOC_G_AUDOUT)] = "VIDIOC_G_AUDOUT", + [_IOC_NR(VIDIOC_S_AUDOUT)] = "VIDIOC_S_AUDOUT", + [_IOC_NR(VIDIOC_G_MODULATOR)] = "VIDIOC_G_MODULATOR", + [_IOC_NR(VIDIOC_S_MODULATOR)] = "VIDIOC_S_MODULATOR", + [_IOC_NR(VIDIOC_G_FREQUENCY)] = "VIDIOC_G_FREQUENCY", + [_IOC_NR(VIDIOC_S_FREQUENCY)] = "VIDIOC_S_FREQUENCY", + [_IOC_NR(VIDIOC_CROPCAP)] = "VIDIOC_CROPCAP", + [_IOC_NR(VIDIOC_G_CROP)] = "VIDIOC_G_CROP", + [_IOC_NR(VIDIOC_S_CROP)] = "VIDIOC_S_CROP", + [_IOC_NR(VIDIOC_G_JPEGCOMP)] = "VIDIOC_G_JPEGCOMP", + [_IOC_NR(VIDIOC_S_JPEGCOMP)] = "VIDIOC_S_JPEGCOMP", + [_IOC_NR(VIDIOC_QUERYSTD)] = "VIDIOC_QUERYSTD", + [_IOC_NR(VIDIOC_TRY_FMT)] = "VIDIOC_TRY_FMT", +}; + +/* ----------------------------------------------------------------- */ + +EXPORT_SYMBOL(v4l2_video_std_construct); + +EXPORT_SYMBOL(v4l2_prio_init); +EXPORT_SYMBOL(v4l2_prio_change); +EXPORT_SYMBOL(v4l2_prio_open); +EXPORT_SYMBOL(v4l2_prio_close); +EXPORT_SYMBOL(v4l2_prio_max); +EXPORT_SYMBOL(v4l2_prio_check); + +EXPORT_SYMBOL(v4l2_field_names); +EXPORT_SYMBOL(v4l2_type_names); +EXPORT_SYMBOL(v4l2_ioctl_names); + +/* + * Local variables: + * c-basic-offset: 8 + * End: + */ -- cgit v1.2.3