| /* |
| * 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 <bdirks@pacbell.net> |
| * based on code by Alan Cox, <alan@cymru.net> |
| * |
| */ |
| |
| /* |
| * 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, <alan@redhat.com> |
| * |
| * Fixes: |
| */ |
| |
| /* |
| * Video4linux 1/2 integration by Justin Schoeman |
| * <justin@suntiger.ee.up.ac.za> |
| * 2.4 PROCFS support ported from 2.4 kernels by |
| * Iñaki García Etxebarria <garetxe@euskalnet.net> |
| * Makefile fix by "W. Michael Petullo" <mike@flyn.org> |
| * 2.4 devfs support ported from 2.4 kernels by |
| * Dan Merillat <dan@merillat.org> |
| * Added Gerd Knorrs v4l1 enhancements (Justin Schoeman) |
| */ |
| |
| #include <linux/config.h> |
| #include <linux/module.h> |
| #include <linux/types.h> |
| #include <linux/kernel.h> |
| #include <linux/sched.h> |
| #include <linux/smp_lock.h> |
| #include <linux/mm.h> |
| #include <linux/string.h> |
| #include <linux/errno.h> |
| #include <asm/uaccess.h> |
| #include <asm/system.h> |
| #include <asm/pgtable.h> |
| #include <asm/io.h> |
| #include <asm/div64.h> |
| |
| #ifdef CONFIG_KMOD |
| #include <linux/kmod.h> |
| #endif |
| |
| #if defined(CONFIG_UST) || defined(CONFIG_UST_MODULE) |
| #include <linux/ust.h> |
| #endif |
| |
| |
| #include <linux/videodev.h> |
| |
| 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] = { |
| #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", |
| [_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: |
| */ |
