/* * Video capture interface for Linux version 2 * * 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. * * Authors: Alan Cox, (version 1) * Mauro Carvalho Chehab (version 2) * * Fixes: 20000516 Claudio Matsuoka * - Added procfs support */ #define dbgarg(cmd, fmt, arg...) \ do { \ if (vfd->debug & V4L2_DEBUG_IOCTL_ARG) { \ printk(KERN_DEBUG "%s: ", vfd->name); \ v4l_printk_ioctl(cmd); \ printk(" " fmt, ## arg); \ } \ } while (0) #define dbgarg2(fmt, arg...) \ do { \ if (vfd->debug & V4L2_DEBUG_IOCTL_ARG) \ printk(KERN_DEBUG "%s: " fmt, vfd->name, ## arg);\ } while (0) #include #include #include #include #include #include #include #include #include #include #include #include #define __OLD_VIDIOC_ /* To allow fixing old calls*/ #include #ifdef CONFIG_VIDEO_V4L1 #include #endif #include #include #define VIDEO_NUM_DEVICES 256 #define VIDEO_NAME "video4linux" struct std_descr { v4l2_std_id std; const char *descr; }; static const struct std_descr standards[] = { { V4L2_STD_NTSC, "NTSC" }, { V4L2_STD_NTSC_M, "NTSC-M" }, { V4L2_STD_NTSC_M_JP, "NTSC-M-JP" }, { V4L2_STD_NTSC_M_KR, "NTSC-M-KR" }, { V4L2_STD_NTSC_443, "NTSC-443" }, { V4L2_STD_PAL, "PAL" }, { V4L2_STD_PAL_BG, "PAL-BG" }, { V4L2_STD_PAL_B, "PAL-B" }, { V4L2_STD_PAL_B1, "PAL-B1" }, { V4L2_STD_PAL_G, "PAL-G" }, { V4L2_STD_PAL_H, "PAL-H" }, { V4L2_STD_PAL_I, "PAL-I" }, { V4L2_STD_PAL_DK, "PAL-DK" }, { V4L2_STD_PAL_D, "PAL-D" }, { V4L2_STD_PAL_D1, "PAL-D1" }, { V4L2_STD_PAL_K, "PAL-K" }, { V4L2_STD_PAL_M, "PAL-M" }, { V4L2_STD_PAL_N, "PAL-N" }, { V4L2_STD_PAL_Nc, "PAL-Nc" }, { V4L2_STD_PAL_60, "PAL-60" }, { V4L2_STD_SECAM, "SECAM" }, { V4L2_STD_SECAM_B, "SECAM-B" }, { V4L2_STD_SECAM_G, "SECAM-G" }, { V4L2_STD_SECAM_H, "SECAM-H" }, { V4L2_STD_SECAM_DK, "SECAM-DK" }, { V4L2_STD_SECAM_D, "SECAM-D" }, { V4L2_STD_SECAM_K, "SECAM-K" }, { V4L2_STD_SECAM_K1, "SECAM-K1" }, { V4L2_STD_SECAM_L, "SECAM-L" }, { V4L2_STD_SECAM_LC, "SECAM-Lc" }, { 0, "Unknown" } }; /* video4linux standard ID conversion to standard name */ const char *v4l2_norm_to_name(v4l2_std_id id) { u32 myid = id; int i; /* HACK: ppc32 architecture doesn't have __ucmpdi2 function to handle 64 bit comparations. So, on that architecture, with some gcc variants, compilation fails. Currently, the max value is 30bit wide. */ BUG_ON(myid != id); for (i = 0; standards[i].std; i++) if (myid == standards[i].std) break; return standards[i].descr; } EXPORT_SYMBOL(v4l2_norm_to_name); /* 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, const char *name) { u32 index = vs->index; memset(vs, 0, sizeof(struct v4l2_standard)); vs->index = index; vs->id = id; if (id & V4L2_STD_525_60) { 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; } EXPORT_SYMBOL(v4l2_video_std_construct); /* ----------------------------------------------------------------- */ /* some arrays for pretty-printing debug messages of enum types */ const 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", [V4L2_FIELD_INTERLACED_TB] = "interlaced-tb", [V4L2_FIELD_INTERLACED_BT] = "interlaced-bt", }; EXPORT_SYMBOL(v4l2_field_names); const char *v4l2_type_names[] = { [V4L2_BUF_TYPE_VIDEO_CAPTURE] = "vid-cap", [V4L2_BUF_TYPE_VIDEO_OVERLAY] = "vid-overlay", [V4L2_BUF_TYPE_VIDEO_OUTPUT] = "vid-out", [V4L2_BUF_TYPE_VBI_CAPTURE] = "vbi-cap", [V4L2_BUF_TYPE_VBI_OUTPUT] = "vbi-out", [V4L2_BUF_TYPE_SLICED_VBI_CAPTURE] = "sliced-vbi-cap", [V4L2_BUF_TYPE_SLICED_VBI_OUTPUT] = "sliced-vbi-out", [V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY] = "vid-out-overlay", }; EXPORT_SYMBOL(v4l2_type_names); static const char *v4l2_memory_names[] = { [V4L2_MEMORY_MMAP] = "mmap", [V4L2_MEMORY_USERPTR] = "userptr", [V4L2_MEMORY_OVERLAY] = "overlay", }; #define prt_names(a, arr) ((((a) >= 0) && ((a) < ARRAY_SIZE(arr))) ? \ arr[a] : "unknown") /* ------------------------------------------------------------------ */ /* debug help functions */ #ifdef CONFIG_VIDEO_V4L1_COMPAT static const char *v4l1_ioctls[] = { [_IOC_NR(VIDIOCGCAP)] = "VIDIOCGCAP", [_IOC_NR(VIDIOCGCHAN)] = "VIDIOCGCHAN", [_IOC_NR(VIDIOCSCHAN)] = "VIDIOCSCHAN", [_IOC_NR(VIDIOCGTUNER)] = "VIDIOCGTUNER", [_IOC_NR(VIDIOCSTUNER)] = "VIDIOCSTUNER", [_IOC_NR(VIDIOCGPICT)] = "VIDIOCGPICT", [_IOC_NR(VIDIOCSPICT)] = "VIDIOCSPICT", [_IOC_NR(VIDIOCCAPTURE)] = "VIDIOCCAPTURE", [_IOC_NR(VIDIOCGWIN)] = "VIDIOCGWIN", [_IOC_NR(VIDIOCSWIN)] = "VIDIOCSWIN", [_IOC_NR(VIDIOCGFBUF)] = "VIDIOCGFBUF", [_IOC_NR(VIDIOCSFBUF)] = "VIDIOCSFBUF", [_IOC_NR(VIDIOCKEY)] = "VIDIOCKEY", [_IOC_NR(VIDIOCGFREQ)] = "VIDIOCGFREQ", [_IOC_NR(VIDIOCSFREQ)] = "VIDIOCSFREQ", [_IOC_NR(VIDIOCGAUDIO)] = "VIDIOCGAUDIO", [_IOC_NR(VIDIOCSAUDIO)] = "VIDIOCSAUDIO", [_IOC_NR(VIDIOCSYNC)] = "VIDIOCSYNC", [_IOC_NR(VIDIOCMCAPTURE)] = "VIDIOCMCAPTURE", [_IOC_NR(VIDIOCGMBUF)] = "VIDIOCGMBUF", [_IOC_NR(VIDIOCGUNIT)] = "VIDIOCGUNIT", [_IOC_NR(VIDIOCGCAPTURE)] = "VIDIOCGCAPTURE", [_IOC_NR(VIDIOCSCAPTURE)] = "VIDIOCSCAPTURE", [_IOC_NR(VIDIOCSPLAYMODE)] = "VIDIOCSPLAYMODE", [_IOC_NR(VIDIOCSWRITEMODE)] = "VIDIOCSWRITEMODE", [_IOC_NR(VIDIOCGPLAYINFO)] = "VIDIOCGPLAYINFO", [_IOC_NR(VIDIOCSMICROCODE)] = "VIDIOCSMICROCODE", [_IOC_NR(VIDIOCGVBIFMT)] = "VIDIOCGVBIFMT", [_IOC_NR(VIDIOCSVBIFMT)] = "VIDIOCSVBIFMT" }; #define V4L1_IOCTLS ARRAY_SIZE(v4l1_ioctls) #endif static const char *v4l2_ioctls[] = { [_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", [_IOC_NR(VIDIOC_ENUMAUDIO)] = "VIDIOC_ENUMAUDIO", [_IOC_NR(VIDIOC_ENUMAUDOUT)] = "VIDIOC_ENUMAUDOUT", [_IOC_NR(VIDIOC_G_PRIORITY)] = "VIDIOC_G_PRIORITY", [_IOC_NR(VIDIOC_S_PRIORITY)] = "VIDIOC_S_PRIORITY", [_IOC_NR(VIDIOC_G_SLICED_VBI_CAP)] = "VIDIOC_G_SLICED_VBI_CAP", [_IOC_NR(VIDIOC_LOG_STATUS)] = "VIDIOC_LOG_STATUS", [_IOC_NR(VIDIOC_G_EXT_CTRLS)] = "VIDIOC_G_EXT_CTRLS", [_IOC_NR(VIDIOC_S_EXT_CTRLS)] = "VIDIOC_S_EXT_CTRLS", [_IOC_NR(VIDIOC_TRY_EXT_CTRLS)] = "VIDIOC_TRY_EXT_CTRLS", #if 1 [_IOC_NR(VIDIOC_ENUM_FRAMESIZES)] = "VIDIOC_ENUM_FRAMESIZES", [_IOC_NR(VIDIOC_ENUM_FRAMEINTERVALS)] = "VIDIOC_ENUM_FRAMEINTERVALS", [_IOC_NR(VIDIOC_G_ENC_INDEX)] = "VIDIOC_G_ENC_INDEX", [_IOC_NR(VIDIOC_ENCODER_CMD)] = "VIDIOC_ENCODER_CMD", [_IOC_NR(VIDIOC_TRY_ENCODER_CMD)] = "VIDIOC_TRY_ENCODER_CMD", [_IOC_NR(VIDIOC_DBG_S_REGISTER)] = "VIDIOC_DBG_S_REGISTER", [_IOC_NR(VIDIOC_DBG_G_REGISTER)] = "VIDIOC_DBG_G_REGISTER", [_IOC_NR(VIDIOC_G_CHIP_IDENT)] = "VIDIOC_G_CHIP_IDENT", [_IOC_NR(VIDIOC_S_HW_FREQ_SEEK)] = "VIDIOC_S_HW_FREQ_SEEK", #endif }; #define V4L2_IOCTLS ARRAY_SIZE(v4l2_ioctls) static const char *v4l2_int_ioctls[] = { #ifdef CONFIG_VIDEO_V4L1_COMPAT [_IOC_NR(DECODER_GET_CAPABILITIES)] = "DECODER_GET_CAPABILITIES", [_IOC_NR(DECODER_GET_STATUS)] = "DECODER_GET_STATUS", [_IOC_NR(DECODER_SET_NORM)] = "DECODER_SET_NORM", [_IOC_NR(DECODER_SET_INPUT)] = "DECODER_SET_INPUT", [_IOC_NR(DECODER_SET_OUTPUT)] = "DECODER_SET_OUTPUT", [_IOC_NR(DECODER_ENABLE_OUTPUT)] = "DECODER_ENABLE_OUTPUT", [_IOC_NR(DECODER_SET_PICTURE)] = "DECODER_SET_PICTURE", [_IOC_NR(DECODER_SET_GPIO)] = "DECODER_SET_GPIO", [_IOC_NR(DECODER_INIT)] = "DECODER_INIT", [_IOC_NR(DECODER_SET_VBI_BYPASS)] = "DECODER_SET_VBI_BYPASS", [_IOC_NR(DECODER_DUMP)] = "DECODER_DUMP", #endif [_IOC_NR(AUDC_SET_RADIO)] = "AUDC_SET_RADIO", [_IOC_NR(TUNER_SET_TYPE_ADDR)] = "TUNER_SET_TYPE_ADDR", [_IOC_NR(TUNER_SET_STANDBY)] = "TUNER_SET_STANDBY", [_IOC_NR(TUNER_SET_CONFIG)] = "TUNER_SET_CONFIG", [_IOC_NR(VIDIOC_INT_S_TUNER_MODE)] = "VIDIOC_INT_S_TUNER_MODE", [_IOC_NR(VIDIOC_INT_RESET)] = "VIDIOC_INT_RESET", [_IOC_NR(VIDIOC_INT_AUDIO_CLOCK_FREQ)] = "VIDIOC_INT_AUDIO_CLOCK_FREQ", [_IOC_NR(VIDIOC_INT_DECODE_VBI_LINE)] = "VIDIOC_INT_DECODE_VBI_LINE", [_IOC_NR(VIDIOC_INT_S_VBI_DATA)] = "VIDIOC_INT_S_VBI_DATA", [_IOC_NR(VIDIOC_INT_G_VBI_DATA)] = "VIDIOC_INT_G_VBI_DATA", [_IOC_NR(VIDIOC_INT_I2S_CLOCK_FREQ)] = "VIDIOC_INT_I2S_CLOCK_FREQ", [_IOC_NR(VIDIOC_INT_S_STANDBY)] = "VIDIOC_INT_S_STANDBY", [_IOC_NR(VIDIOC_INT_S_AUDIO_ROUTING)] = "VIDIOC_INT_S_AUDIO_ROUTING", [_IOC_NR(VIDIOC_INT_G_AUDIO_ROUTING)] = "VIDIOC_INT_G_AUDIO_ROUTING", [_IOC_NR(VIDIOC_INT_S_VIDEO_ROUTING)] = "VIDIOC_INT_S_VIDEO_ROUTING", [_IOC_NR(VIDIOC_INT_G_VIDEO_ROUTING)] = "VIDIOC_INT_G_VIDEO_ROUTING", [_IOC_NR(VIDIOC_INT_S_CRYSTAL_FREQ)] = "VIDIOC_INT_S_CRYSTAL_FREQ", [_IOC_NR(VIDIOC_INT_INIT)] = "VIDIOC_INT_INIT", [_IOC_NR(VIDIOC_INT_G_STD_OUTPUT)] = "VIDIOC_INT_G_STD_OUTPUT", [_IOC_NR(VIDIOC_INT_S_STD_OUTPUT)] = "VIDIOC_INT_S_STD_OUTPUT", }; #define V4L2_INT_IOCTLS ARRAY_SIZE(v4l2_int_ioctls) /* Common ioctl debug function. This function can be used by external ioctl messages as well as internal V4L ioctl */ void v4l_printk_ioctl(unsigned int cmd) { char *dir, *type; switch (_IOC_TYPE(cmd)) { case 'd': if (_IOC_NR(cmd) >= V4L2_INT_IOCTLS) { type = "v4l2_int"; break; } printk("%s", v4l2_int_ioctls[_IOC_NR(cmd)]); return; #ifdef CONFIG_VIDEO_V4L1_COMPAT case 'v': if (_IOC_NR(cmd) >= V4L1_IOCTLS) { type = "v4l1"; break; } printk("%s", v4l1_ioctls[_IOC_NR(cmd)]); return; #endif case 'V': if (_IOC_NR(cmd) >= V4L2_IOCTLS) { type = "v4l2"; break; } printk("%s", v4l2_ioctls[_IOC_NR(cmd)]); return; default: type = "unknown"; } switch (_IOC_DIR(cmd)) { case _IOC_NONE: dir = "--"; break; case _IOC_READ: dir = "r-"; break; case _IOC_WRITE: dir = "-w"; break; case _IOC_READ | _IOC_WRITE: dir = "rw"; break; default: dir = "*ERR*"; break; } printk("%s ioctl '%c', dir=%s, #%d (0x%08x)", type, _IOC_TYPE(cmd), dir, _IOC_NR(cmd), cmd); } EXPORT_SYMBOL(v4l_printk_ioctl); /* * sysfs stuff */ static ssize_t show_index(struct device *cd, struct device_attribute *attr, char *buf) { struct video_device *vfd = container_of(cd, struct video_device, class_dev); return sprintf(buf, "%i\n", vfd->index); } static ssize_t show_name(struct device *cd, struct device_attribute *attr, char *buf) { struct video_device *vfd = container_of(cd, struct video_device, class_dev); return sprintf(buf, "%.*s\n", (int)sizeof(vfd->name), vfd->name); } static struct device_attribute video_device_attrs[] = { __ATTR(name, S_IRUGO, show_name, NULL), __ATTR(index, S_IRUGO, show_index, NULL), __ATTR_NULL }; struct video_device *video_device_alloc(void) { struct video_device *vfd; vfd = kzalloc(sizeof(*vfd),GFP_KERNEL); return vfd; } EXPORT_SYMBOL(video_device_alloc); void video_device_release(struct video_device *vfd) { kfree(vfd); } EXPORT_SYMBOL(video_device_release); static void video_release(struct device *cd) { struct video_device *vfd = container_of(cd, struct video_device, class_dev); #if 1 /* needed until all drivers are fixed */ if (!vfd->release) return; #endif vfd->release(vfd); } static struct class video_class = { .name = VIDEO_NAME, .dev_attrs = video_device_attrs, .dev_release = video_release, }; /* * Active devices */ static struct video_device *video_device[VIDEO_NUM_DEVICES]; static DEFINE_MUTEX(videodev_lock); struct video_device* video_devdata(struct file *file) { return video_device[iminor(file->f_path.dentry->d_inode)]; } EXPORT_SYMBOL(video_devdata); /* * Open a video device - FIXME: Obsoleted */ static int video_open(struct inode *inode, struct file *file) { unsigned int minor = iminor(inode); int err = 0; struct video_device *vfl; const struct file_operations *old_fops; if(minor>=VIDEO_NUM_DEVICES) return -ENODEV; lock_kernel(); mutex_lock(&videodev_lock); vfl=video_device[minor]; if(vfl==NULL) { mutex_unlock(&videodev_lock); request_module("char-major-%d-%d", VIDEO_MAJOR, minor); mutex_lock(&videodev_lock); vfl=video_device[minor]; if (vfl==NULL) { mutex_unlock(&videodev_lock); unlock_kernel(); return -ENODEV; } } old_fops = file->f_op; file->f_op = fops_get(vfl->fops); if(file->f_op->open) err = file->f_op->open(inode,file); if (err) { fops_put(file->f_op); file->f_op = fops_get(old_fops); } fops_put(old_fops); mutex_unlock(&videodev_lock); unlock_kernel(); return err; } /* * helper function -- handles userspace copying for ioctl arguments */ #ifdef __OLD_VIDIOC_ static unsigned int video_fix_command(unsigned int cmd) { switch (cmd) { case VIDIOC_OVERLAY_OLD: cmd = VIDIOC_OVERLAY; break; case VIDIOC_S_PARM_OLD: cmd = VIDIOC_S_PARM; break; case VIDIOC_S_CTRL_OLD: cmd = VIDIOC_S_CTRL; break; case VIDIOC_G_AUDIO_OLD: cmd = VIDIOC_G_AUDIO; break; case VIDIOC_G_AUDOUT_OLD: cmd = VIDIOC_G_AUDOUT; break; case VIDIOC_CROPCAP_OLD: cmd = VIDIOC_CROPCAP; break; } return cmd; } #endif /* * Obsolete usercopy function - Should be removed soon */ int video_usercopy(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg, int (*func)(struct inode *inode, struct file *file, unsigned int cmd, void *arg)) { char sbuf[128]; void *mbuf = NULL; void *parg = NULL; int err = -EINVAL; int is_ext_ctrl; size_t ctrls_size = 0; void __user *user_ptr = NULL; #ifdef __OLD_VIDIOC_ cmd = video_fix_command(cmd); #endif is_ext_ctrl = (cmd == VIDIOC_S_EXT_CTRLS || cmd == VIDIOC_G_EXT_CTRLS || cmd == VIDIOC_TRY_EXT_CTRLS); /* Copy arguments into temp kernel buffer */ switch (_IOC_DIR(cmd)) { case _IOC_NONE: parg = NULL; break; case _IOC_READ: case _IOC_WRITE: case (_IOC_WRITE | _IOC_READ): if (_IOC_SIZE(cmd) <= sizeof(sbuf)) { parg = sbuf; } else { /* too big to allocate from stack */ mbuf = kmalloc(_IOC_SIZE(cmd),GFP_KERNEL); if (NULL == mbuf) return -ENOMEM; parg = mbuf; } err = -EFAULT; if (_IOC_DIR(cmd) & _IOC_WRITE) if (copy_from_user(parg, (void __user *)arg, _IOC_SIZE(cmd))) goto out; break; } if (is_ext_ctrl) { struct v4l2_ext_controls *p = parg; /* In case of an error, tell the caller that it wasn't a specific control that caused it. */ p->error_idx = p->count; user_ptr = (void __user *)p->controls; if (p->count) { ctrls_size = sizeof(struct v4l2_ext_control) * p->count; /* Note: v4l2_ext_controls fits in sbuf[] so mbuf is still NULL. */ mbuf = kmalloc(ctrls_size, GFP_KERNEL); err = -ENOMEM; if (NULL == mbuf) goto out_ext_ctrl; err = -EFAULT; if (copy_from_user(mbuf, user_ptr, ctrls_size)) goto out_ext_ctrl; p->controls = mbuf; } } /* call driver */ err = func(inode, file, cmd, parg); if (err == -ENOIOCTLCMD) err = -EINVAL; if (is_ext_ctrl) { struct v4l2_ext_controls *p = parg; p->controls = (void *)user_ptr; if (p->count && err == 0 && copy_to_user(user_ptr, mbuf, ctrls_size)) err = -EFAULT; goto out_ext_ctrl; } if (err < 0) goto out; out_ext_ctrl: /* Copy results into user buffer */ switch (_IOC_DIR(cmd)) { case _IOC_READ: case (_IOC_WRITE | _IOC_READ): if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd))) err = -EFAULT; break; } out: kfree(mbuf); return err; } EXPORT_SYMBOL(video_usercopy); /* * open/release helper functions -- handle exclusive opens * Should be removed soon */ int video_exclusive_open(struct inode *inode, struct file *file) { struct video_device *vfl = video_devdata(file); int retval = 0; mutex_lock(&vfl->lock); if (vfl->users) { retval = -EBUSY; } else { vfl->users++; } mutex_unlock(&vfl->lock); return retval; } EXPORT_SYMBOL(video_exclusive_open); int video_exclusive_release(struct inode *inode, struct file *file) { struct video_device *vfl = video_devdata(file); vfl->users--; return 0; } EXPORT_SYMBOL(video_exclusive_release); static void dbgbuf(unsigned int cmd, struct video_device *vfd, struct v4l2_buffer *p) { struct v4l2_timecode *tc=&p->timecode; dbgarg (cmd, "%02ld:%02d:%02d.%08ld index=%d, type=%s, " "bytesused=%d, flags=0x%08d, " "field=%0d, sequence=%d, memory=%s, offset/userptr=0x%08lx, length=%d\n", (p->timestamp.tv_sec/3600), (int)(p->timestamp.tv_sec/60)%60, (int)(p->timestamp.tv_sec%60), p->timestamp.tv_usec, p->index, prt_names(p->type, v4l2_type_names), p->bytesused, p->flags, p->field, p->sequence, prt_names(p->memory, v4l2_memory_names), p->m.userptr, p->length); dbgarg2("timecode=%02d:%02d:%02d type=%d, " "flags=0x%08d, frames=%d, userbits=0x%08x\n", tc->hours,tc->minutes,tc->seconds, tc->type, tc->flags, tc->frames, *(__u32 *) tc->userbits); } static inline void dbgrect(struct video_device *vfd, char *s, struct v4l2_rect *r) { dbgarg2("%sRect start at %dx%d, size=%dx%d\n", s, r->left, r->top, r->width, r->height); }; static inline void v4l_print_pix_fmt (struct video_device *vfd, struct v4l2_pix_format *fmt) { dbgarg2 ("width=%d, height=%d, format=%c%c%c%c, field=%s, " "bytesperline=%d sizeimage=%d, colorspace=%d\n", fmt->width,fmt->height, (fmt->pixelformat & 0xff), (fmt->pixelformat >> 8) & 0xff, (fmt->pixelformat >> 16) & 0xff, (fmt->pixelformat >> 24) & 0xff, prt_names(fmt->field, v4l2_field_names), fmt->bytesperline, fmt->sizeimage, fmt->colorspace); }; static inline void v4l_print_ext_ctrls(unsigned int cmd, struct video_device *vfd, struct v4l2_ext_controls *c, int show_vals) { __u32 i; if (!(vfd->debug & V4L2_DEBUG_IOCTL_ARG)) return; dbgarg(cmd, ""); printk(KERN_CONT "class=0x%x", c->ctrl_class); for (i = 0; i < c->count; i++) { if (show_vals) printk(KERN_CONT " id/val=0x%x/0x%x", c->controls[i].id, c->controls[i].value); else printk(KERN_CONT " id=0x%x", c->controls[i].id); } printk(KERN_CONT "\n"); }; static inline int check_ext_ctrls(struct v4l2_ext_controls *c, int allow_priv) { __u32 i; /* zero the reserved fields */ c->reserved[0] = c->reserved[1] = 0; for (i = 0; i < c->count; i++) { c->controls[i].reserved2[0] = 0; c->controls[i].reserved2[1] = 0; } /* V4L2_CID_PRIVATE_BASE cannot be used as control class when using extended controls. Only when passed in through VIDIOC_G_CTRL and VIDIOC_S_CTRL is it allowed for backwards compatibility. */ if (!allow_priv && c->ctrl_class == V4L2_CID_PRIVATE_BASE) return 0; /* Check that all controls are from the same control class. */ for (i = 0; i < c->count; i++) { if (V4L2_CTRL_ID2CLASS(c->controls[i].id) != c->ctrl_class) { c->error_idx = i; return 0; } } return 1; } static int check_fmt (struct video_device *vfd, enum v4l2_buf_type type) { switch (type) { case V4L2_BUF_TYPE_VIDEO_CAPTURE: if (vfd->vidioc_try_fmt_vid_cap) return (0); break; case V4L2_BUF_TYPE_VIDEO_OVERLAY: if (vfd->vidioc_try_fmt_vid_overlay) return (0); break; case V4L2_BUF_TYPE_VIDEO_OUTPUT: if (vfd->vidioc_try_fmt_vid_out) return (0); break; case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY: if (vfd->vidioc_try_fmt_vid_out_overlay) return (0); break; case V4L2_BUF_TYPE_VBI_CAPTURE: if (vfd->vidioc_try_fmt_vbi_cap) return (0); break; case V4L2_BUF_TYPE_VBI_OUTPUT: if (vfd->vidioc_try_fmt_vbi_out) return (0); break; case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE: if (vfd->vidioc_try_fmt_sliced_vbi_cap) return (0); break; case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT: if (vfd->vidioc_try_fmt_sliced_vbi_out) return (0); break; case V4L2_BUF_TYPE_PRIVATE: if (vfd->vidioc_try_fmt_type_private) return (0); break; } return (-EINVAL); } static int __video_do_ioctl(struct inode *inode, struct file *file, unsigned int cmd, void *arg) { struct video_device *vfd = video_devdata(file); void *fh = file->private_data; int ret = -EINVAL; if ( (vfd->debug & V4L2_DEBUG_IOCTL) && !(vfd->debug & V4L2_DEBUG_IOCTL_ARG)) { v4l_print_ioctl(vfd->name, cmd); printk("\n"); } #ifdef CONFIG_VIDEO_V4L1_COMPAT /*********************************************************** Handles calls to the obsoleted V4L1 API Due to the nature of VIDIOCGMBUF, each driver that supports V4L1 should implement its own handler for this ioctl. ***********************************************************/ /* --- streaming capture ------------------------------------- */ if (cmd == VIDIOCGMBUF) { struct video_mbuf *p=arg; memset(p, 0, sizeof(*p)); if (!vfd->vidiocgmbuf) return ret; ret=vfd->vidiocgmbuf(file, fh, p); if (!ret) dbgarg (cmd, "size=%d, frames=%d, offsets=0x%08lx\n", p->size, p->frames, (unsigned long)p->offsets); return ret; } /******************************************************** All other V4L1 calls are handled by v4l1_compat module. Those calls will be translated into V4L2 calls, and __video_do_ioctl will be called again, with one or more V4L2 ioctls. ********************************************************/ if (_IOC_TYPE(cmd)=='v') return v4l_compat_translate_ioctl(inode,file,cmd,arg, __video_do_ioctl); #endif switch(cmd) { /* --- capabilities ------------------------------------------ */ case VIDIOC_QUERYCAP: { struct v4l2_capability *cap = (struct v4l2_capability*)arg; memset(cap, 0, sizeof(*cap)); if (!vfd->vidioc_querycap) break; ret=vfd->vidioc_querycap(file, fh, cap); if (!ret) dbgarg (cmd, "driver=%s, card=%s, bus=%s, " "version=0x%08x, " "capabilities=0x%08x\n", cap->driver,cap->card,cap->bus_info, cap->version, cap->capabilities); break; } /* --- priority ------------------------------------------ */ case VIDIOC_G_PRIORITY: { enum v4l2_priority *p=arg; if (!vfd->vidioc_g_priority) break; ret=vfd->vidioc_g_priority(file, fh, p); if (!ret) dbgarg(cmd, "priority is %d\n", *p); break; } case VIDIOC_S_PRIORITY: { enum v4l2_priority *p=arg; if (!vfd->vidioc_s_priority) break; dbgarg(cmd, "setting priority to %d\n", *p); ret=vfd->vidioc_s_priority(file, fh, *p); break; } /* --- capture ioctls ---------------------------------------- */ case VIDIOC_ENUM_FMT: { struct v4l2_fmtdesc *f = arg; enum v4l2_buf_type type; unsigned int index; index = f->index; type = f->type; memset(f,0,sizeof(*f)); f->index = index; f->type = type; switch (type) { case V4L2_BUF_TYPE_VIDEO_CAPTURE: if (vfd->vidioc_enum_fmt_vid_cap) ret = vfd->vidioc_enum_fmt_vid_cap(file, fh, f); break; case V4L2_BUF_TYPE_VIDEO_OVERLAY: if (vfd->vidioc_enum_fmt_vid_overlay) ret = vfd->vidioc_enum_fmt_vid_overlay(file, fh, f); break; #if 1 /* V4L2_BUF_TYPE_VBI_CAPTURE should not support VIDIOC_ENUM_FMT * according to the spec. The bttv and saa7134 drivers support * it though, so just warn that this is deprecated and will be * removed in the near future. */ case V4L2_BUF_TYPE_VBI_CAPTURE: if (vfd->vidioc_enum_fmt_vbi_cap) { printk(KERN_WARNING "vidioc_enum_fmt_vbi_cap will be removed in 2.6.28!\n"); ret = vfd->vidioc_enum_fmt_vbi_cap(file, fh, f); } break; #endif case V4L2_BUF_TYPE_VIDEO_OUTPUT: if (vfd->vidioc_enum_fmt_vid_out) ret = vfd->vidioc_enum_fmt_vid_out(file, fh, f); break; case V4L2_BUF_TYPE_PRIVATE: if (vfd->vidioc_enum_fmt_type_private) ret = vfd->vidioc_enum_fmt_type_private(file, fh, f); break; default: break; } if (!ret) dbgarg (cmd, "index=%d, type=%d, flags=%d, " "pixelformat=%c%c%c%c, description='%s'\n", f->index, f->type, f->flags, (f->pixelformat & 0xff), (f->pixelformat >> 8) & 0xff, (f->pixelformat >> 16) & 0xff, (f->pixelformat >> 24) & 0xff, f->description); break; } case VIDIOC_G_FMT: { struct v4l2_format *f = (struct v4l2_format *)arg; memset(f->fmt.raw_data, 0, sizeof(f->fmt.raw_data)); /* FIXME: Should be one dump per type */ dbgarg(cmd, "type=%s\n", prt_names(f->type, v4l2_type_names)); switch (f->type) { case V4L2_BUF_TYPE_VIDEO_CAPTURE: if (vfd->vidioc_g_fmt_vid_cap) ret = vfd->vidioc_g_fmt_vid_cap(file, fh, f); if (!ret) v4l_print_pix_fmt(vfd, &f->fmt.pix); break; case V4L2_BUF_TYPE_VIDEO_OVERLAY: if (vfd->vidioc_g_fmt_vid_overlay) ret = vfd->vidioc_g_fmt_vid_overlay(file, fh, f); break; case V4L2_BUF_TYPE_VIDEO_OUTPUT: if (vfd->vidioc_g_fmt_vid_out) ret = vfd->vidioc_g_fmt_vid_out(file, fh, f); if (!ret) v4l_print_pix_fmt(vfd, &f->fmt.pix); break; case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY: if (vfd->vidioc_g_fmt_vid_out_overlay) ret = vfd->vidioc_g_fmt_vid_out_overlay(file, fh, f); break; case V4L2_BUF_TYPE_VBI_CAPTURE: if (vfd->vidioc_g_fmt_vbi_cap) ret = vfd->vidioc_g_fmt_vbi_cap(file, fh, f); break; case V4L2_BUF_TYPE_VBI_OUTPUT: if (vfd->vidioc_g_fmt_vbi_out) ret = vfd->vidioc_g_fmt_vbi_out(file, fh, f); break; case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE: if (vfd->vidioc_g_fmt_sliced_vbi_cap) ret = vfd->vidioc_g_fmt_sliced_vbi_cap(file, fh, f); break; case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT: if (vfd->vidioc_g_fmt_sliced_vbi_out) ret = vfd->vidioc_g_fmt_sliced_vbi_out(file, fh, f); break; case V4L2_BUF_TYPE_PRIVATE: if (vfd->vidioc_g_fmt_type_private) ret = vfd->vidioc_g_fmt_type_private(file, fh, f); break; } break; } case VIDIOC_S_FMT: { struct v4l2_format *f = (struct v4l2_format *)arg; /* FIXME: Should be one dump per type */ dbgarg(cmd, "type=%s\n", prt_names(f->type, v4l2_type_names)); switch (f->type) { case V4L2_BUF_TYPE_VIDEO_CAPTURE: v4l_print_pix_fmt(vfd, &f->fmt.pix); if (vfd->vidioc_s_fmt_vid_cap) ret = vfd->vidioc_s_fmt_vid_cap(file, fh, f); break; case V4L2_BUF_TYPE_VIDEO_OVERLAY: if (vfd->vidioc_s_fmt_vid_overlay) ret = vfd->vidioc_s_fmt_vid_overlay(file, fh, f); break; case V4L2_BUF_TYPE_VIDEO_OUTPUT: v4l_print_pix_fmt(vfd, &f->fmt.pix); if (vfd->vidioc_s_fmt_vid_out) ret = vfd->vidioc_s_fmt_vid_out(file, fh, f); break; case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY: if (vfd->vidioc_s_fmt_vid_out_overlay) ret = vfd->vidioc_s_fmt_vid_out_overlay(file, fh, f); break; case V4L2_BUF_TYPE_VBI_CAPTURE: if (vfd->vidioc_s_fmt_vbi_cap) ret = vfd->vidioc_s_fmt_vbi_cap(file, fh, f); break; case V4L2_BUF_TYPE_VBI_OUTPUT: if (vfd->vidioc_s_fmt_vbi_out) ret = vfd->vidioc_s_fmt_vbi_out(file, fh, f); break; case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE: if (vfd->vidioc_s_fmt_sliced_vbi_cap) ret = vfd->vidioc_s_fmt_sliced_vbi_cap(file, fh, f); break; case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT: if (vfd->vidioc_s_fmt_sliced_vbi_out) ret = vfd->vidioc_s_fmt_sliced_vbi_out(file, fh, f); break; case V4L2_BUF_TYPE_PRIVATE: if (vfd->vidioc_s_fmt_type_private) ret = vfd->vidioc_s_fmt_type_private(file, fh, f); break; } break; } case VIDIOC_TRY_FMT: { struct v4l2_format *f = (struct v4l2_format *)arg; /* FIXME: Should be one dump per type */ dbgarg (cmd, "type=%s\n", prt_names(f->type, v4l2_type_names)); switch (f->type) { case V4L2_BUF_TYPE_VIDEO_CAPTURE: if (vfd->vidioc_try_fmt_vid_cap) ret = vfd->vidioc_try_fmt_vid_cap(file, fh, f); if (!ret) v4l_print_pix_fmt(vfd, &f->fmt.pix); break; case V4L2_BUF_TYPE_VIDEO_OVERLAY: if (vfd->vidioc_try_fmt_vid_overlay) ret = vfd->vidioc_try_fmt_vid_overlay(file, fh, f); break; case V4L2_BUF_TYPE_VIDEO_OUTPUT: if (vfd->vidioc_try_fmt_vid_out) ret = vfd->vidioc_try_fmt_vid_out(file, fh, f); if (!ret) v4l_print_pix_fmt(vfd, &f->fmt.pix); break; case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY: if (vfd->vidioc_try_fmt_vid_out_overlay) ret = vfd->vidioc_try_fmt_vid_out_overlay(file, fh, f); break; case V4L2_BUF_TYPE_VBI_CAPTURE: if (vfd->vidioc_try_fmt_vbi_cap) ret = vfd->vidioc_try_fmt_vbi_cap(file, fh, f); break; case V4L2_BUF_TYPE_VBI_OUTPUT: if (vfd->vidioc_try_fmt_vbi_out) ret = vfd->vidioc_try_fmt_vbi_out(file, fh, f); break; case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE: if (vfd->vidioc_try_fmt_sliced_vbi_cap) ret = vfd->vidioc_try_fmt_sliced_vbi_cap(file, fh, f); break; case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT: if (vfd->vidioc_try_fmt_sliced_vbi_out) ret = vfd->vidioc_try_fmt_sliced_vbi_out(file, fh, f); break; case V4L2_BUF_TYPE_PRIVATE: if (vfd->vidioc_try_fmt_type_private) ret = vfd->vidioc_try_fmt_type_private(file, fh, f); break; } break; } /* FIXME: Those buf reqs could be handled here, with some changes on videobuf to allow its header to be included at videodev2.h or being merged at videodev2. */ case VIDIOC_REQBUFS: { struct v4l2_requestbuffers *p=arg; if (!vfd->vidioc_reqbufs) break; ret = check_fmt (vfd, p->type); if (ret) break; ret=vfd->vidioc_reqbufs(file, fh, p); dbgarg (cmd, "count=%d, type=%s, memory=%s\n", p->count, prt_names(p->type, v4l2_type_names), prt_names(p->memory, v4l2_memory_names)); break; } case VIDIOC_QUERYBUF: { struct v4l2_buffer *p=arg; if (!vfd->vidioc_querybuf) break; ret = check_fmt (vfd, p->type); if (ret) break; ret=vfd->vidioc_querybuf(file, fh, p); if (!ret) dbgbuf(cmd,vfd,p); break; } case VIDIOC_QBUF: { struct v4l2_buffer *p=arg; if (!vfd->vidioc_qbuf) break; ret = check_fmt (vfd, p->type); if (ret) break; ret=vfd->vidioc_qbuf(file, fh, p); if (!ret) dbgbuf(cmd,vfd,p); break; } case VIDIOC_DQBUF: { struct v4l2_buffer *p=arg; if (!vfd->vidioc_dqbuf) break; ret = check_fmt (vfd, p->type); if (ret) break; ret=vfd->vidioc_dqbuf(file, fh, p); if (!ret) dbgbuf(cmd,vfd,p); break; } case VIDIOC_OVERLAY: { int *i = arg; if (!vfd->vidioc_overlay) break; dbgarg (cmd, "value=%d\n",*i); ret=vfd->vidioc_overlay(file, fh, *i); break; } case VIDIOC_G_FBUF: { struct v4l2_framebuffer *p = arg; if (!vfd->vidioc_g_fbuf) break; ret = vfd->vidioc_g_fbuf(file, fh, arg); if (!ret) { dbgarg(cmd, "capability=0x%x, flags=%d, base=0x%08lx\n", p->capability, p->flags, (unsigned long)p->base); v4l_print_pix_fmt(vfd, &p->fmt); } break; } case VIDIOC_S_FBUF: { struct v4l2_framebuffer *p = arg; if (!vfd->vidioc_s_fbuf) break; dbgarg(cmd, "capability=0x%x, flags=%d, base=0x%08lx\n", p->capability, p->flags, (unsigned long)p->base); v4l_print_pix_fmt(vfd, &p->fmt); ret = vfd->vidioc_s_fbuf(file, fh, arg); break; } case VIDIOC_STREAMON: { enum v4l2_buf_type i = *(int *)arg; if (!vfd->vidioc_streamon) break; dbgarg(cmd, "type=%s\n", prt_names(i, v4l2_type_names)); ret=vfd->vidioc_streamon(file, fh,i); break; } case VIDIOC_STREAMOFF: { enum v4l2_buf_type i = *(int *)arg; if (!vfd->vidioc_streamoff) break; dbgarg(cmd, "type=%s\n", prt_names(i, v4l2_type_names)); ret=vfd->vidioc_streamoff(file, fh, i); break; } /* ---------- tv norms ---------- */ case VIDIOC_ENUMSTD: { struct v4l2_standard *p = arg; v4l2_std_id id = vfd->tvnorms, curr_id = 0; unsigned int index = p->index, i, j = 0; const char *descr = ""; /* Return norm array in a canonical way */ for (i = 0; i <= index && id; i++) { /* last std value in the standards array is 0, so this while always ends there since (id & 0) == 0. */ while ((id & standards[j].std) != standards[j].std) j++; curr_id = standards[j].std; descr = standards[j].descr; j++; if (curr_id == 0) break; if (curr_id != V4L2_STD_PAL && curr_id != V4L2_STD_SECAM && curr_id != V4L2_STD_NTSC) id &= ~curr_id; } if (i <= index) return -EINVAL; v4l2_video_std_construct(p, curr_id, descr); p->index = index; dbgarg(cmd, "index=%d, id=0x%Lx, name=%s, fps=%d/%d, " "framelines=%d\n", p->index, (unsigned long long)p->id, p->name, p->frameperiod.numerator, p->frameperiod.denominator, p->framelines); ret = 0; break; } case VIDIOC_G_STD: { v4l2_std_id *id = arg; ret = 0; /* Calls the specific handler */ if (vfd->vidioc_g_std) ret = vfd->vidioc_g_std(file, fh, id); else *id = vfd->current_norm; if (!ret) dbgarg(cmd, "std=0x%08Lx\n", (long long unsigned)*id); break; } case VIDIOC_S_STD: { v4l2_std_id *id = arg,norm; dbgarg(cmd, "std=%08Lx\n", (long long unsigned)*id); norm = (*id) & vfd->tvnorms; if ( vfd->tvnorms && !norm) /* Check if std is supported */ break; /* Calls the specific handler */ if (vfd->vidioc_s_std) ret=vfd->vidioc_s_std(file, fh, &norm); else ret=-EINVAL; /* Updates standard information */ if (ret>=0) vfd->current_norm=norm; break; } case VIDIOC_QUERYSTD: { v4l2_std_id *p=arg; if (!vfd->vidioc_querystd) break; ret=vfd->vidioc_querystd(file, fh, arg); if (!ret) dbgarg (cmd, "detected std=%08Lx\n", (unsigned long long)*p); break; } /* ------ input switching ---------- */ /* FIXME: Inputs can be handled inside videodev2 */ case VIDIOC_ENUMINPUT: { struct v4l2_input *p=arg; int i=p->index; if (!vfd->vidioc_enum_input) break; memset(p, 0, sizeof(*p)); p->index=i; ret=vfd->vidioc_enum_input(file, fh, p); if (!ret) dbgarg (cmd, "index=%d, name=%s, type=%d, " "audioset=%d, " "tuner=%d, std=%08Lx, status=%d\n", p->index,p->name,p->type,p->audioset, p->tuner, (unsigned long long)p->std, p->status); break; } case VIDIOC_G_INPUT: { unsigned int *i = arg; if (!vfd->vidioc_g_input) break; ret=vfd->vidioc_g_input(file, fh, i); if (!ret) dbgarg (cmd, "value=%d\n",*i); break; } case VIDIOC_S_INPUT: { unsigned int *i = arg; if (!vfd->vidioc_s_input) break; dbgarg (cmd, "value=%d\n",*i); ret=vfd->vidioc_s_input(file, fh, *i); break; } /* ------ output switching ---------- */ case VIDIOC_ENUMOUTPUT: { struct v4l2_output *p = arg; int i = p->index; if (!vfd->vidioc_enum_output) break; memset(p, 0, sizeof(*p)); p->index = i; ret = vfd->vidioc_enum_output(file, fh, p); if (!ret) dbgarg(cmd, "index=%d, name=%s, type=%d, " "audioset=0x%x, " "modulator=%d, std=0x%08Lx\n", p->index, p->name, p->type, p->audioset, p->modulator, (unsigned long long)p->std); break; } case VIDIOC_G_OUTPUT: { unsigned int *i = arg; if (!vfd->vidioc_g_output) break; ret=vfd->vidioc_g_output(file, fh, i); if (!ret) dbgarg (cmd, "value=%d\n",*i); break; } case VIDIOC_S_OUTPUT: { unsigned int *i = arg; if (!vfd->vidioc_s_output) break; dbgarg (cmd, "value=%d\n",*i); ret=vfd->vidioc_s_output(file, fh, *i); break; } /* --- controls ---------------------------------------------- */ case VIDIOC_QUERYCTRL: { struct v4l2_queryctrl *p = arg; if (!vfd->vidioc_queryctrl) break; ret = vfd->vidioc_queryctrl(file, fh, p); if (!ret) dbgarg(cmd, "id=0x%x, type=%d, name=%s, min/max=%d/%d, " "step=%d, default=%d, flags=0x%08x\n", p->id, p->type, p->name, p->minimum, p->maximum, p->step, p->default_value, p->flags); else dbgarg(cmd, "id=0x%x\n", p->id); break; } case VIDIOC_G_CTRL: { struct v4l2_control *p = arg; if (vfd->vidioc_g_ctrl) ret = vfd->vidioc_g_ctrl(file, fh, p); else if (vfd->vidioc_g_ext_ctrls) { struct v4l2_ext_controls ctrls; struct v4l2_ext_control ctrl; ctrls.ctrl_class = V4L2_CTRL_ID2CLASS(p->id); ctrls.count = 1; ctrls.controls = &ctrl; ctrl.id = p->id; ctrl.value = p->value; if (check_ext_ctrls(&ctrls, 1)) { ret = vfd->vidioc_g_ext_ctrls(file, fh, &ctrls); if (ret == 0) p->value = ctrl.value; } } else break; if (!ret) dbgarg(cmd, "id=0x%x, value=%d\n", p->id, p->value); else dbgarg(cmd, "id=0x%x\n", p->id); break; } case VIDIOC_S_CTRL: { struct v4l2_control *p = arg; struct v4l2_ext_controls ctrls; struct v4l2_ext_control ctrl; if (!vfd->vidioc_s_ctrl && !vfd->vidioc_s_ext_ctrls) break; dbgarg(cmd, "id=0x%x, value=%d\n", p->id, p->value); if (vfd->vidioc_s_ctrl) { ret = vfd->vidioc_s_ctrl(file, fh, p); break; } if (!vfd->vidioc_s_ext_ctrls) break; ctrls.ctrl_class = V4L2_CTRL_ID2CLASS(p->id); ctrls.count = 1; ctrls.controls = &ctrl; ctrl.id = p->id; ctrl.value = p->value; if (check_ext_ctrls(&ctrls, 1)) ret = vfd->vidioc_s_ext_ctrls(file, fh, &ctrls); break; } case VIDIOC_G_EXT_CTRLS: { struct v4l2_ext_controls *p = arg; p->error_idx = p->count; if (!vfd->vidioc_g_ext_ctrls) break; if (check_ext_ctrls(p, 0)) ret = vfd->vidioc_g_ext_ctrls(file, fh, p); v4l_print_ext_ctrls(cmd, vfd, p, !ret); break; } case VIDIOC_S_EXT_CTRLS: { struct v4l2_ext_controls *p = arg; p->error_idx = p->count; if (!vfd->vidioc_s_ext_ctrls) break; v4l_print_ext_ctrls(cmd, vfd, p, 1); if (check_ext_ctrls(p, 0)) ret = vfd->vidioc_s_ext_ctrls(file, fh, p); break; } case VIDIOC_TRY_EXT_CTRLS: { struct v4l2_ext_controls *p = arg; p->error_idx = p->count; if (!vfd->vidioc_try_ext_ctrls) break; v4l_print_ext_ctrls(cmd, vfd, p, 1); if (check_ext_ctrls(p, 0)) ret = vfd->vidioc_try_ext_ctrls(file, fh, p); break; } case VIDIOC_QUERYMENU: { struct v4l2_querymenu *p = arg; if (!vfd->vidioc_querymenu) break; ret = vfd->vidioc_querymenu(file, fh, p); if (!ret) dbgarg(cmd, "id=0x%x, index=%d, name=%s\n", p->id, p->index, p->name); else dbgarg(cmd, "id=0x%x, index=%d\n", p->id, p->index); break; } /* --- audio ---------------------------------------------- */ case VIDIOC_ENUMAUDIO: { struct v4l2_audio *p = arg; if (!vfd->vidioc_enumaudio) break; ret = vfd->vidioc_enumaudio(file, fh, p); if (!ret) dbgarg(cmd, "index=%d, name=%s, capability=0x%x, " "mode=0x%x\n", p->index, p->name, p->capability, p->mode); else dbgarg(cmd, "index=%d\n", p->index); break; } case VIDIOC_G_AUDIO: { struct v4l2_audio *p = arg; __u32 index = p->index; if (!vfd->vidioc_g_audio) break; memset(p, 0, sizeof(*p)); p->index = index; ret = vfd->vidioc_g_audio(file, fh, p); if (!ret) dbgarg(cmd, "index=%d, name=%s, capability=0x%x, " "mode=0x%x\n", p->index, p->name, p->capability, p->mode); else dbgarg(cmd, "index=%d\n", p->index); break; } case VIDIOC_S_AUDIO: { struct v4l2_audio *p = arg; if (!vfd->vidioc_s_audio) break; dbgarg(cmd, "index=%d, name=%s, capability=0x%x, " "mode=0x%x\n", p->index, p->name, p->capability, p->mode); ret = vfd->vidioc_s_audio(file, fh, p); break; } case VIDIOC_ENUMAUDOUT: { struct v4l2_audioout *p=arg; if (!vfd->vidioc_enumaudout) break; dbgarg(cmd, "Enum for index=%d\n", p->index); ret=vfd->vidioc_enumaudout(file, fh, p); if (!ret) dbgarg2("index=%d, name=%s, capability=%d, " "mode=%d\n", p->index, p->name, p->capability,p->mode); break; } case VIDIOC_G_AUDOUT: { struct v4l2_audioout *p=arg; if (!vfd->vidioc_g_audout) break; dbgarg(cmd, "Enum for index=%d\n", p->index); ret=vfd->vidioc_g_audout(file, fh, p); if (!ret) dbgarg2("index=%d, name=%s, capability=%d, " "mode=%d\n", p->index, p->name, p->capability,p->mode); break; } case VIDIOC_S_AUDOUT: { struct v4l2_audioout *p=arg; if (!vfd->vidioc_s_audout) break; dbgarg(cmd, "index=%d, name=%s, capability=%d, " "mode=%d\n", p->index, p->name, p->capability,p->mode); ret=vfd->vidioc_s_audout(file, fh, p); break; } case VIDIOC_G_MODULATOR: { struct v4l2_modulator *p=arg; if (!vfd->vidioc_g_modulator) break; ret=vfd->vidioc_g_modulator(file, fh, p); if (!ret) dbgarg(cmd, "index=%d, name=%s, " "capability=%d, rangelow=%d," " rangehigh=%d, txsubchans=%d\n", p->index, p->name,p->capability, p->rangelow, p->rangehigh, p->txsubchans); break; } case VIDIOC_S_MODULATOR: { struct v4l2_modulator *p=arg; if (!vfd->vidioc_s_modulator) break; dbgarg(cmd, "index=%d, name=%s, capability=%d, " "rangelow=%d, rangehigh=%d, txsubchans=%d\n", p->index, p->name,p->capability,p->rangelow, p->rangehigh,p->txsubchans); ret=vfd->vidioc_s_modulator(file, fh, p); break; } case VIDIOC_G_CROP: { struct v4l2_crop *p=arg; if (!vfd->vidioc_g_crop) break; dbgarg(cmd, "type=%s\n", prt_names(p->type, v4l2_type_names)); ret=vfd->vidioc_g_crop(file, fh, p); if (!ret) { dbgrect(vfd, "", &p->c); } break; } case VIDIOC_S_CROP: { struct v4l2_crop *p=arg; if (!vfd->vidioc_s_crop) break; dbgarg(cmd, "type=%s\n", prt_names(p->type, v4l2_type_names)); dbgrect(vfd, "", &p->c); ret=vfd->vidioc_s_crop(file, fh, p); break; } case VIDIOC_CROPCAP: { struct v4l2_cropcap *p = arg; /*FIXME: Should also show v4l2_fract pixelaspect */ if (!vfd->vidioc_cropcap) break; dbgarg(cmd, "type=%s\n", prt_names(p->type, v4l2_type_names)); ret = vfd->vidioc_cropcap(file, fh, p); if (!ret) { dbgrect(vfd, "bounds ", &p->bounds); dbgrect(vfd, "defrect ", &p->defrect); } break; } case VIDIOC_G_JPEGCOMP: { struct v4l2_jpegcompression *p=arg; if (!vfd->vidioc_g_jpegcomp) break; ret=vfd->vidioc_g_jpegcomp(file, fh, p); if (!ret) dbgarg (cmd, "quality=%d, APPn=%d, " "APP_len=%d, COM_len=%d, " "jpeg_markers=%d\n", p->quality,p->APPn,p->APP_len, p->COM_len,p->jpeg_markers); break; } case VIDIOC_S_JPEGCOMP: { struct v4l2_jpegcompression *p=arg; if (!vfd->vidioc_g_jpegcomp) break; dbgarg (cmd, "quality=%d, APPn=%d, APP_len=%d, " "COM_len=%d, jpeg_markers=%d\n", p->quality,p->APPn,p->APP_len, p->COM_len,p->jpeg_markers); ret=vfd->vidioc_s_jpegcomp(file, fh, p); break; } case VIDIOC_G_ENC_INDEX: { struct v4l2_enc_idx *p=arg; if (!vfd->vidioc_g_enc_index) break; ret=vfd->vidioc_g_enc_index(file, fh, p); if (!ret) dbgarg (cmd, "entries=%d, entries_cap=%d\n", p->entries,p->entries_cap); break; } case VIDIOC_ENCODER_CMD: { struct v4l2_encoder_cmd *p = arg; if (!vfd->vidioc_encoder_cmd) break; memset(&p->raw, 0, sizeof(p->raw)); ret = vfd->vidioc_encoder_cmd(file, fh, p); if (!ret) dbgarg(cmd, "cmd=%d, flags=%x\n", p->cmd, p->flags); break; } case VIDIOC_TRY_ENCODER_CMD: { struct v4l2_encoder_cmd *p = arg; if (!vfd->vidioc_try_encoder_cmd) break; memset(&p->raw, 0, sizeof(p->raw)); ret = vfd->vidioc_try_encoder_cmd(file, fh, p); if (!ret) dbgarg(cmd, "cmd=%d, flags=%x\n", p->cmd, p->flags); break; } case VIDIOC_G_PARM: { struct v4l2_streamparm *p=arg; __u32 type=p->type; memset(p,0,sizeof(*p)); p->type=type; if (vfd->vidioc_g_parm) { ret=vfd->vidioc_g_parm(file, fh, p); } else { struct v4l2_standard s; if (p->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) return -EINVAL; v4l2_video_std_construct(&s, vfd->current_norm, v4l2_norm_to_name(vfd->current_norm)); p->parm.capture.timeperframe = s.frameperiod; ret=0; } dbgarg (cmd, "type=%d\n", p->type); break; } case VIDIOC_S_PARM: { struct v4l2_streamparm *p=arg; if (!vfd->vidioc_s_parm) break; dbgarg (cmd, "type=%d\n", p->type); ret=vfd->vidioc_s_parm(file, fh, p); break; } case VIDIOC_G_TUNER: { struct v4l2_tuner *p = arg; __u32 index = p->index; if (!vfd->vidioc_g_tuner) break; memset(p, 0, sizeof(*p)); p->index = index; ret = vfd->vidioc_g_tuner(file, fh, p); if (!ret) dbgarg(cmd, "index=%d, name=%s, type=%d, " "capability=0x%x, rangelow=%d, " "rangehigh=%d, signal=%d, afc=%d, " "rxsubchans=0x%x, audmode=%d\n", p->index, p->name, p->type, p->capability, p->rangelow, p->rangehigh, p->signal, p->afc, p->rxsubchans, p->audmode); break; } case VIDIOC_S_TUNER: { struct v4l2_tuner *p = arg; if (!vfd->vidioc_s_tuner) break; dbgarg(cmd, "index=%d, name=%s, type=%d, " "capability=0x%x, rangelow=%d, " "rangehigh=%d, signal=%d, afc=%d, " "rxsubchans=0x%x, audmode=%d\n", p->index, p->name, p->type, p->capability, p->rangelow, p->rangehigh, p->signal, p->afc, p->rxsubchans, p->audmode); ret = vfd->vidioc_s_tuner(file, fh, p); break; } case VIDIOC_G_FREQUENCY: { struct v4l2_frequency *p = arg; if (!vfd->vidioc_g_frequency) break; memset(p->reserved, 0, sizeof(p->reserved)); ret = vfd->vidioc_g_frequency(file, fh, p); if (!ret) dbgarg(cmd, "tuner=%d, type=%d, frequency=%d\n", p->tuner, p->type, p->frequency); break; } case VIDIOC_S_FREQUENCY: { struct v4l2_frequency *p=arg; if (!vfd->vidioc_s_frequency) break; dbgarg (cmd, "tuner=%d, type=%d, frequency=%d\n", p->tuner,p->type,p->frequency); ret=vfd->vidioc_s_frequency(file, fh, p); break; } case VIDIOC_G_SLICED_VBI_CAP: { struct v4l2_sliced_vbi_cap *p = arg; __u32 type = p->type; if (!vfd->vidioc_g_sliced_vbi_cap) break; memset(p, 0, sizeof(*p)); p->type = type; dbgarg(cmd, "type=%s\n", prt_names(p->type, v4l2_type_names)); ret = vfd->vidioc_g_sliced_vbi_cap(file, fh, p); if (!ret) dbgarg2("service_set=%d\n", p->service_set); break; } case VIDIOC_LOG_STATUS: { if (!vfd->vidioc_log_status) break; ret=vfd->vidioc_log_status(file, fh); break; } #ifdef CONFIG_VIDEO_ADV_DEBUG case VIDIOC_DBG_G_REGISTER: { struct v4l2_register *p=arg; if (!capable(CAP_SYS_ADMIN)) ret=-EPERM; else if (vfd->vidioc_g_register) ret=vfd->vidioc_g_register(file, fh, p); break; } case VIDIOC_DBG_S_REGISTER: { struct v4l2_register *p=arg; if (!capable(CAP_SYS_ADMIN)) ret=-EPERM; else if (vfd->vidioc_s_register) ret=vfd->vidioc_s_register(file, fh, p); break; } #endif case VIDIOC_G_CHIP_IDENT: { struct v4l2_chip_ident *p=arg; if (!vfd->vidioc_g_chip_ident) break; ret=vfd->vidioc_g_chip_ident(file, fh, p); if (!ret) dbgarg (cmd, "chip_ident=%u, revision=0x%x\n", p->ident, p->revision); break; } default: { if (!vfd->vidioc_default) break; ret = vfd->vidioc_default(file, fh, cmd, arg); break; } case VIDIOC_S_HW_FREQ_SEEK: { struct v4l2_hw_freq_seek *p = arg; if (!vfd->vidioc_s_hw_freq_seek) break; dbgarg(cmd, "tuner=%d, type=%d, seek_upward=%d, wrap_around=%d\n", p->tuner, p->type, p->seek_upward, p->wrap_around); ret = vfd->vidioc_s_hw_freq_seek(file, fh, p); break; } } /* switch */ if (vfd->debug & V4L2_DEBUG_IOCTL_ARG) { if (ret < 0) { v4l_print_ioctl(vfd->name, cmd); printk(KERN_CONT " error %d\n", ret); } } return ret; } int video_ioctl2 (struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) { char sbuf[128]; void *mbuf = NULL; void *parg = NULL; int err = -EINVAL; int is_ext_ctrl; size_t ctrls_size = 0; void __user *user_ptr = NULL; #ifdef __OLD_VIDIOC_ cmd = video_fix_command(cmd); #endif is_ext_ctrl = (cmd == VIDIOC_S_EXT_CTRLS || cmd == VIDIOC_G_EXT_CTRLS || cmd == VIDIOC_TRY_EXT_CTRLS); /* Copy arguments into temp kernel buffer */ switch (_IOC_DIR(cmd)) { case _IOC_NONE: parg = NULL; break; case _IOC_READ: case _IOC_WRITE: case (_IOC_WRITE | _IOC_READ): if (_IOC_SIZE(cmd) <= sizeof(sbuf)) { parg = sbuf; } else { /* too big to allocate from stack */ mbuf = kmalloc(_IOC_SIZE(cmd),GFP_KERNEL); if (NULL == mbuf) return -ENOMEM; parg = mbuf; } err = -EFAULT; if (_IOC_DIR(cmd) & _IOC_WRITE) if (copy_from_user(parg, (void __user *)arg, _IOC_SIZE(cmd))) goto out; break; } if (is_ext_ctrl) { struct v4l2_ext_controls *p = parg; /* In case of an error, tell the caller that it wasn't a specific control that caused it. */ p->error_idx = p->count; user_ptr = (void __user *)p->controls; if (p->count) { ctrls_size = sizeof(struct v4l2_ext_control) * p->count; /* Note: v4l2_ext_controls fits in sbuf[] so mbuf is still NULL. */ mbuf = kmalloc(ctrls_size, GFP_KERNEL); err = -ENOMEM; if (NULL == mbuf) goto out_ext_ctrl; err = -EFAULT; if (copy_from_user(mbuf, user_ptr, ctrls_size)) goto out_ext_ctrl; p->controls = mbuf; } } /* Handles IOCTL */ err = __video_do_ioctl(inode, file, cmd, parg); if (err == -ENOIOCTLCMD) err = -EINVAL; if (is_ext_ctrl) { struct v4l2_ext_controls *p = parg; p->controls = (void *)user_ptr; if (p->count && err == 0 && copy_to_user(user_ptr, mbuf, ctrls_size)) err = -EFAULT; goto out_ext_ctrl; } if (err < 0) goto out; out_ext_ctrl: /* Copy results into user buffer */ switch (_IOC_DIR(cmd)) { case _IOC_READ: case (_IOC_WRITE | _IOC_READ): if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd))) err = -EFAULT; break; } out: kfree(mbuf); return err; } EXPORT_SYMBOL(video_ioctl2); /** * get_index - assign stream number based on parent device * @vdev: video_device to assign index number to, vdev->dev should be assigned * @num: -1 if auto assign, requested number otherwise * * * returns -ENFILE if num is already in use, a free index number if * successful. */ static int get_index(struct video_device *vdev, int num) { u32 used = 0; const unsigned max_index = sizeof(used) * 8 - 1; int i; /* Currently a single v4l driver instance cannot create more than 32 devices. Increase to u64 or an array of u32 if more are needed. */ if (num > max_index) { printk(KERN_ERR "videodev: %s num is too large\n", __func__); return -EINVAL; } for (i = 0; i < VIDEO_NUM_DEVICES; i++) { if (video_device[i] != NULL && video_device[i] != vdev && video_device[i]->dev == vdev->dev) { used |= 1 << video_device[i]->index; } } if (num >= 0) { if (used & (1 << num)) return -ENFILE; return num; } i = ffz(used); return i > max_index ? -ENFILE : i; } static const struct file_operations video_fops; int video_register_device(struct video_device *vfd, int type, int nr) { return video_register_device_index(vfd, type, nr, -1); } EXPORT_SYMBOL(video_register_device); /** * video_register_device - register video4linux devices * @vfd: video device structure we want to register * @type: type of device to register * @nr: which device number (0 == /dev/video0, 1 == /dev/video1, ... * -1 == first free) * * The registration code assigns minor numbers based on the type * requested. -ENFILE is returned in all the device slots for this * category are full. If not then the minor field is set and the * driver initialize function is called (if non %NULL). * * Zero is returned on success. * * Valid types are * * %VFL_TYPE_GRABBER - A frame grabber * * %VFL_TYPE_VTX - A teletext device * * %VFL_TYPE_VBI - Vertical blank data (undecoded) * * %VFL_TYPE_RADIO - A radio card */ int video_register_device_index(struct video_device *vfd, int type, int nr, int index) { int i=0; int base; int end; int ret; char *name_base; switch(type) { case VFL_TYPE_GRABBER: base=MINOR_VFL_TYPE_GRABBER_MIN; end=MINOR_VFL_TYPE_GRABBER_MAX+1; name_base = "video"; break; case VFL_TYPE_VTX: base=MINOR_VFL_TYPE_VTX_MIN; end=MINOR_VFL_TYPE_VTX_MAX+1; name_base = "vtx"; break; case VFL_TYPE_VBI: base=MINOR_VFL_TYPE_VBI_MIN; end=MINOR_VFL_TYPE_VBI_MAX+1; name_base = "vbi"; break; case VFL_TYPE_RADIO: base=MINOR_VFL_TYPE_RADIO_MIN; end=MINOR_VFL_TYPE_RADIO_MAX+1; name_base = "radio"; break; default: printk(KERN_ERR "%s called with unknown type: %d\n", __func__, type); return -1; } /* pick a minor number */ mutex_lock(&videodev_lock); if (nr >= 0 && nr < end-base) { /* use the one the driver asked for */ i = base+nr; if (NULL != video_device[i]) { mutex_unlock(&videodev_lock); return -ENFILE; } } else { /* use first free */ for(i=base;iminor=i; ret = get_index(vfd, index); if (ret < 0) { printk(KERN_ERR "%s: get_index failed\n", __func__); goto fail_minor; } vfd->index = ret; mutex_unlock(&videodev_lock); mutex_init(&vfd->lock); /* sysfs class */ memset(&vfd->class_dev, 0x00, sizeof(vfd->class_dev)); vfd->class_dev.class = &video_class; vfd->class_dev.devt = MKDEV(VIDEO_MAJOR, vfd->minor); if (vfd->dev) vfd->class_dev.parent = vfd->dev; sprintf(vfd->class_dev.bus_id, "%s%d", name_base, i - base); ret = device_register(&vfd->class_dev); if (ret < 0) { printk(KERN_ERR "%s: device_register failed\n", __func__); goto fail_minor; } #if 1 /* needed until all drivers are fixed */ if (!vfd->release) printk(KERN_WARNING "videodev: \"%s\" has no release callback. " "Please fix your driver for proper sysfs support, see " "http://lwn.net/Articles/36850/\n", vfd->name); #endif return 0; fail_minor: mutex_lock(&videodev_lock); video_device[vfd->minor] = NULL; vfd->minor = -1; mutex_unlock(&videodev_lock); return ret; } EXPORT_SYMBOL(video_register_device_index); /** * video_unregister_device - unregister a video4linux device * @vfd: the device to unregister * * This unregisters the passed device and deassigns the minor * number. Future open calls will be met with errors. */ void video_unregister_device(struct video_device *vfd) { mutex_lock(&videodev_lock); if(video_device[vfd->minor]!=vfd) panic("videodev: bad unregister"); video_device[vfd->minor]=NULL; device_unregister(&vfd->class_dev); mutex_unlock(&videodev_lock); } EXPORT_SYMBOL(video_unregister_device); /* * Video fs operations */ static const struct file_operations video_fops= { .owner = THIS_MODULE, .llseek = no_llseek, .open = video_open, }; /* * Initialise video for linux */ static int __init videodev_init(void) { int ret; printk(KERN_INFO "Linux video capture interface: v2.00\n"); if (register_chrdev(VIDEO_MAJOR, VIDEO_NAME, &video_fops)) { printk(KERN_WARNING "video_dev: unable to get major %d\n", VIDEO_MAJOR); return -EIO; } ret = class_register(&video_class); if (ret < 0) { unregister_chrdev(VIDEO_MAJOR, VIDEO_NAME); printk(KERN_WARNING "video_dev: class_register failed\n"); return -EIO; } return 0; } static void __exit videodev_exit(void) { class_unregister(&video_class); unregister_chrdev(VIDEO_MAJOR, VIDEO_NAME); } module_init(videodev_init) module_exit(videodev_exit) MODULE_AUTHOR("Alan Cox, Mauro Carvalho Chehab "); MODULE_DESCRIPTION("Device registrar for Video4Linux drivers v2"); MODULE_LICENSE("GPL"); /* * Local variables: * c-basic-offset: 8 * End: */