/* * 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) */ /* 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] = { [0 ... 255] = "UNKNOWN", [_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", [_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: */