/*************************************************************************** * Video4Linux2 driver for ZC0301 Image Processor and Control Chip * * * * Copyright (C) 2006 by Luca Risolia * * * * Informations about the chip internals needed to enable the I2C protocol * * have been taken from the documentation of the ZC030x Video4Linux1 * * driver written by Andrew Birkett * * * * 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. * * * * This program is distributed in the hope that it will be useful, * * but WITHOUT ANY WARRANTY; without even the implied warranty of * * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * * GNU General Public License for more details. * * * * You should have received a copy of the GNU General Public License * * along with this program; if not, write to the Free Software * * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. * ***************************************************************************/ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "zc0301.h" /*****************************************************************************/ #define ZC0301_MODULE_NAME "V4L2 driver for ZC0301 " \ "Image Processor and Control Chip" #define ZC0301_MODULE_AUTHOR "(C) 2006 Luca Risolia" #define ZC0301_AUTHOR_EMAIL "" #define ZC0301_MODULE_LICENSE "GPL" #define ZC0301_MODULE_VERSION "1:1.02" #define ZC0301_MODULE_VERSION_CODE KERNEL_VERSION(1, 0, 2) /*****************************************************************************/ MODULE_DEVICE_TABLE(usb, zc0301_id_table); MODULE_AUTHOR(ZC0301_MODULE_AUTHOR " " ZC0301_AUTHOR_EMAIL); MODULE_DESCRIPTION(ZC0301_MODULE_NAME); MODULE_VERSION(ZC0301_MODULE_VERSION); MODULE_LICENSE(ZC0301_MODULE_LICENSE); static short video_nr[] = {[0 ... ZC0301_MAX_DEVICES-1] = -1}; module_param_array(video_nr, short, NULL, 0444); MODULE_PARM_DESC(video_nr, "\n<-1|n[,...]> Specify V4L2 minor mode number." "\n -1 = use next available (default)" "\n n = use minor number n (integer >= 0)" "\nYou can specify up to " __MODULE_STRING(ZC0301_MAX_DEVICES) " cameras this way." "\nFor example:" "\nvideo_nr=-1,2,-1 would assign minor number 2 to" "\nthe second registered camera and use auto for the first" "\none and for every other camera." "\n"); static short force_munmap[] = {[0 ... ZC0301_MAX_DEVICES-1] = ZC0301_FORCE_MUNMAP}; module_param_array(force_munmap, bool, NULL, 0444); MODULE_PARM_DESC(force_munmap, "\n<0|1[,...]> Force the application to unmap previously" "\nmapped buffer memory before calling any VIDIOC_S_CROP or" "\nVIDIOC_S_FMT ioctl's. Not all the applications support" "\nthis feature. This parameter is specific for each" "\ndetected camera." "\n 0 = do not force memory unmapping" "\n 1 = force memory unmapping (save memory)" "\nDefault value is "__MODULE_STRING(SN9C102_FORCE_MUNMAP)"." "\n"); static unsigned int frame_timeout[] = {[0 ... ZC0301_MAX_DEVICES-1] = ZC0301_FRAME_TIMEOUT}; module_param_array(frame_timeout, uint, NULL, 0644); MODULE_PARM_DESC(frame_timeout, "\n Timeout for a video frame in seconds." "\nThis parameter is specific for each detected camera." "\nDefault value is "__MODULE_STRING(ZC0301_FRAME_TIMEOUT)"." "\n"); #ifdef ZC0301_DEBUG static unsigned short debug = ZC0301_DEBUG_LEVEL; module_param(debug, ushort, 0644); MODULE_PARM_DESC(debug, "\n Debugging information level, from 0 to 3:" "\n0 = none (use carefully)" "\n1 = critical errors" "\n2 = significant informations" "\n3 = more verbose messages" "\nLevel 3 is useful for testing only, when only " "one device is used." "\nDefault value is "__MODULE_STRING(ZC0301_DEBUG_LEVEL)"." "\n"); #endif /*****************************************************************************/ static u32 zc0301_request_buffers(struct zc0301_device* cam, u32 count, enum zc0301_io_method io) { struct v4l2_pix_format* p = &(cam->sensor.pix_format); struct v4l2_rect* r = &(cam->sensor.cropcap.bounds); const size_t imagesize = cam->module_param.force_munmap || io == IO_READ ? (p->width * p->height * p->priv) / 8 : (r->width * r->height * p->priv) / 8; void* buff = NULL; u32 i; if (count > ZC0301_MAX_FRAMES) count = ZC0301_MAX_FRAMES; cam->nbuffers = count; while (cam->nbuffers > 0) { if ((buff = vmalloc_32(cam->nbuffers * PAGE_ALIGN(imagesize)))) break; cam->nbuffers--; } for (i = 0; i < cam->nbuffers; i++) { cam->frame[i].bufmem = buff + i*PAGE_ALIGN(imagesize); cam->frame[i].buf.index = i; cam->frame[i].buf.m.offset = i*PAGE_ALIGN(imagesize); cam->frame[i].buf.length = imagesize; cam->frame[i].buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; cam->frame[i].buf.sequence = 0; cam->frame[i].buf.field = V4L2_FIELD_NONE; cam->frame[i].buf.memory = V4L2_MEMORY_MMAP; cam->frame[i].buf.flags = 0; } return cam->nbuffers; } static void zc0301_release_buffers(struct zc0301_device* cam) { if (cam->nbuffers) { vfree(cam->frame[0].bufmem); cam->nbuffers = 0; } cam->frame_current = NULL; } static void zc0301_empty_framequeues(struct zc0301_device* cam) { u32 i; INIT_LIST_HEAD(&cam->inqueue); INIT_LIST_HEAD(&cam->outqueue); for (i = 0; i < ZC0301_MAX_FRAMES; i++) { cam->frame[i].state = F_UNUSED; cam->frame[i].buf.bytesused = 0; } } static void zc0301_requeue_outqueue(struct zc0301_device* cam) { struct zc0301_frame_t *i; list_for_each_entry(i, &cam->outqueue, frame) { i->state = F_QUEUED; list_add(&i->frame, &cam->inqueue); } INIT_LIST_HEAD(&cam->outqueue); } static void zc0301_queue_unusedframes(struct zc0301_device* cam) { unsigned long lock_flags; u32 i; for (i = 0; i < cam->nbuffers; i++) if (cam->frame[i].state == F_UNUSED) { cam->frame[i].state = F_QUEUED; spin_lock_irqsave(&cam->queue_lock, lock_flags); list_add_tail(&cam->frame[i].frame, &cam->inqueue); spin_unlock_irqrestore(&cam->queue_lock, lock_flags); } } /*****************************************************************************/ int zc0301_write_reg(struct zc0301_device* cam, u16 index, u16 value) { struct usb_device* udev = cam->usbdev; int res; res = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0xa0, 0x40, value, index, NULL, 0, ZC0301_CTRL_TIMEOUT); if (res < 0) { DBG(3, "Failed to write a register (index 0x%04X, " "value 0x%02X, error %d)",index, value, res); return -1; } return 0; } int zc0301_read_reg(struct zc0301_device* cam, u16 index) { struct usb_device* udev = cam->usbdev; u8* buff = cam->control_buffer; int res; res = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), 0xa1, 0xc0, 0x0001, index, buff, 1, ZC0301_CTRL_TIMEOUT); if (res < 0) DBG(3, "Failed to read a register (index 0x%04X, error %d)", index, res); PDBGG("Read: index 0x%04X, value: 0x%04X", index, (int)(*buff)); return (res >= 0) ? (int)(*buff) : -1; } int zc0301_i2c_read(struct zc0301_device* cam, u16 address, u8 length) { int err = 0, res, r0, r1; err += zc0301_write_reg(cam, 0x0092, address); err += zc0301_write_reg(cam, 0x0090, 0x02); msleep(1); res = zc0301_read_reg(cam, 0x0091); if (res < 0) err += res; r0 = zc0301_read_reg(cam, 0x0095); if (r0 < 0) err += r0; r1 = zc0301_read_reg(cam, 0x0096); if (r1 < 0) err += r1; res = (length <= 1) ? r0 : r0 | (r1 << 8); if (err) DBG(3, "I2C read failed at address 0x%04X, value: 0x%04X", address, res); PDBGG("I2C read: address 0x%04X, value: 0x%04X", address, res); return err ? -1 : res; } int zc0301_i2c_write(struct zc0301_device* cam, u16 address, u16 value) { int err = 0, res; err += zc0301_write_reg(cam, 0x0092, address); err += zc0301_write_reg(cam, 0x0093, value & 0xff); err += zc0301_write_reg(cam, 0x0094, value >> 8); err += zc0301_write_reg(cam, 0x0090, 0x01); msleep(1); res = zc0301_read_reg(cam, 0x0091); if (res < 0) err += res; if (err) DBG(3, "I2C write failed at address 0x%04X, value: 0x%04X", address, value); PDBGG("I2C write: address 0x%04X, value: 0x%04X", address, value); return err ? -1 : 0; } /*****************************************************************************/ static void zc0301_urb_complete(struct urb *urb, struct pt_regs* regs) { struct zc0301_device* cam = urb->context; struct zc0301_frame_t** f; size_t imagesize; u8 i; int err = 0; if (urb->status == -ENOENT) return; f = &cam->frame_current; if (cam->stream == STREAM_INTERRUPT) { cam->stream = STREAM_OFF; if ((*f)) (*f)->state = F_QUEUED; DBG(3, "Stream interrupted"); wake_up(&cam->wait_stream); } if (cam->state & DEV_DISCONNECTED) return; if (cam->state & DEV_MISCONFIGURED) { wake_up_interruptible(&cam->wait_frame); return; } if (cam->stream == STREAM_OFF || list_empty(&cam->inqueue)) goto resubmit_urb; if (!(*f)) (*f) = list_entry(cam->inqueue.next, struct zc0301_frame_t, frame); imagesize = (cam->sensor.pix_format.width * cam->sensor.pix_format.height * cam->sensor.pix_format.priv) / 8; for (i = 0; i < urb->number_of_packets; i++) { unsigned int len, status; void *pos; u16* soi; u8 sof; len = urb->iso_frame_desc[i].actual_length; status = urb->iso_frame_desc[i].status; pos = urb->iso_frame_desc[i].offset + urb->transfer_buffer; if (status) { DBG(3, "Error in isochronous frame"); (*f)->state = F_ERROR; continue; } sof = (*(soi = pos) == 0xd8ff); PDBGG("Isochrnous frame: length %u, #%u i,", len, i); if ((*f)->state == F_QUEUED || (*f)->state == F_ERROR) start_of_frame: if (sof) { (*f)->state = F_GRABBING; (*f)->buf.bytesused = 0; do_gettimeofday(&(*f)->buf.timestamp); DBG(3, "SOF detected: new video frame"); } if ((*f)->state == F_GRABBING) { if (sof && (*f)->buf.bytesused) goto end_of_frame; if ((*f)->buf.bytesused + len > imagesize) { DBG(3, "Video frame size exceeded"); (*f)->state = F_ERROR; continue; } memcpy((*f)->bufmem+(*f)->buf.bytesused, pos, len); (*f)->buf.bytesused += len; if ((*f)->buf.bytesused == imagesize) { u32 b; end_of_frame: b = (*f)->buf.bytesused; (*f)->state = F_DONE; (*f)->buf.sequence= ++cam->frame_count; spin_lock(&cam->queue_lock); list_move_tail(&(*f)->frame, &cam->outqueue); if (!list_empty(&cam->inqueue)) (*f) = list_entry(cam->inqueue.next, struct zc0301_frame_t, frame); else (*f) = NULL; spin_unlock(&cam->queue_lock); DBG(3, "Video frame captured: : %lu bytes", (unsigned long)(b)); if (!(*f)) goto resubmit_urb; if (sof) goto start_of_frame; } } } resubmit_urb: urb->dev = cam->usbdev; err = usb_submit_urb(urb, GFP_ATOMIC); if (err < 0 && err != -EPERM) { cam->state |= DEV_MISCONFIGURED; DBG(1, "usb_submit_urb() failed"); } wake_up_interruptible(&cam->wait_frame); } static int zc0301_start_transfer(struct zc0301_device* cam) { struct usb_device *udev = cam->usbdev; struct urb* urb; const unsigned int wMaxPacketSize[] = {0, 128, 192, 256, 384, 512, 768, 1023}; const unsigned int psz = wMaxPacketSize[ZC0301_ALTERNATE_SETTING]; s8 i, j; int err = 0; for (i = 0; i < ZC0301_URBS; i++) { cam->transfer_buffer[i] = kzalloc(ZC0301_ISO_PACKETS * psz, GFP_KERNEL); if (!cam->transfer_buffer[i]) { err = -ENOMEM; DBG(1, "Not enough memory"); goto free_buffers; } } for (i = 0; i < ZC0301_URBS; i++) { urb = usb_alloc_urb(ZC0301_ISO_PACKETS, GFP_KERNEL); cam->urb[i] = urb; if (!urb) { err = -ENOMEM; DBG(1, "usb_alloc_urb() failed"); goto free_urbs; } urb->dev = udev; urb->context = cam; urb->pipe = usb_rcvisocpipe(udev, 1); urb->transfer_flags = URB_ISO_ASAP; urb->number_of_packets = ZC0301_ISO_PACKETS; urb->complete = zc0301_urb_complete; urb->transfer_buffer = cam->transfer_buffer[i]; urb->transfer_buffer_length = psz * ZC0301_ISO_PACKETS; urb->interval = 1; for (j = 0; j < ZC0301_ISO_PACKETS; j++) { urb->iso_frame_desc[j].offset = psz * j; urb->iso_frame_desc[j].length = psz; } } err = usb_set_interface(udev, 0, ZC0301_ALTERNATE_SETTING); if (err) { DBG(1, "usb_set_interface() failed"); goto free_urbs; } cam->frame_current = NULL; for (i = 0; i < ZC0301_URBS; i++) { err = usb_submit_urb(cam->urb[i], GFP_KERNEL); if (err) { for (j = i-1; j >= 0; j--) usb_kill_urb(cam->urb[j]); DBG(1, "usb_submit_urb() failed, error %d", err); goto free_urbs; } } return 0; free_urbs: for (i = 0; (i < ZC0301_URBS) && cam->urb[i]; i++) usb_free_urb(cam->urb[i]); free_buffers: for (i = 0; (i < ZC0301_URBS) && cam->transfer_buffer[i]; i++) kfree(cam->transfer_buffer[i]); return err; } static int zc0301_stop_transfer(struct zc0301_device* cam) { struct usb_device *udev = cam->usbdev; s8 i; int err = 0; if (cam->state & DEV_DISCONNECTED) return 0; for (i = ZC0301_URBS-1; i >= 0; i--) { usb_kill_urb(cam->urb[i]); usb_free_urb(cam->urb[i]); kfree(cam->transfer_buffer[i]); } err = usb_set_interface(udev, 0, 0); /* 0 Mb/s */ if (err) DBG(3, "usb_set_interface() failed"); return err; } static int zc0301_stream_interrupt(struct zc0301_device* cam) { long timeout; cam->stream = STREAM_INTERRUPT; timeout = wait_event_timeout(cam->wait_stream, (cam->stream == STREAM_OFF) || (cam->state & DEV_DISCONNECTED), ZC0301_URB_TIMEOUT); if (cam->state & DEV_DISCONNECTED) return -ENODEV; else if (cam->stream != STREAM_OFF) { cam->state |= DEV_MISCONFIGURED; DBG(1, "URB timeout reached. The camera is misconfigured. To " "use it, close and open /dev/video%d again.", cam->v4ldev->minor); return -EIO; } return 0; } /*****************************************************************************/ static int zc0301_set_compression(struct zc0301_device* cam, struct v4l2_jpegcompression* compression) { int r, err = 0; if ((r = zc0301_read_reg(cam, 0x0008)) < 0) err += r; err += zc0301_write_reg(cam, 0x0008, r | 0x11 | compression->quality); return err ? -EIO : 0; } static int zc0301_init(struct zc0301_device* cam) { struct zc0301_sensor* s = &cam->sensor; struct v4l2_control ctrl; struct v4l2_queryctrl *qctrl; struct v4l2_rect* rect; u8 i = 0; int err = 0; if (!(cam->state & DEV_INITIALIZED)) { init_waitqueue_head(&cam->open); qctrl = s->qctrl; rect = &(s->cropcap.defrect); cam->compression.quality = ZC0301_COMPRESSION_QUALITY; } else { /* use current values */ qctrl = s->_qctrl; rect = &(s->_rect); } if (s->init) { err = s->init(cam); if (err) { DBG(3, "Sensor initialization failed"); return err; } } if ((err = zc0301_set_compression(cam, &cam->compression))) { DBG(3, "set_compression() failed"); return err; } if (s->set_crop) if ((err = s->set_crop(cam, rect))) { DBG(3, "set_crop() failed"); return err; } if (s->set_ctrl) { for (i = 0; i < ARRAY_SIZE(s->qctrl); i++) if (s->qctrl[i].id != 0 && !(s->qctrl[i].flags & V4L2_CTRL_FLAG_DISABLED)) { ctrl.id = s->qctrl[i].id; ctrl.value = qctrl[i].default_value; err = s->set_ctrl(cam, &ctrl); if (err) { DBG(3, "Set %s control failed", s->qctrl[i].name); return err; } DBG(3, "Image sensor supports '%s' control", s->qctrl[i].name); } } if (!(cam->state & DEV_INITIALIZED)) { mutex_init(&cam->fileop_mutex); spin_lock_init(&cam->queue_lock); init_waitqueue_head(&cam->wait_frame); init_waitqueue_head(&cam->wait_stream); cam->nreadbuffers = 2; memcpy(s->_qctrl, s->qctrl, sizeof(s->qctrl)); memcpy(&(s->_rect), &(s->cropcap.defrect), sizeof(struct v4l2_rect)); cam->state |= DEV_INITIALIZED; } DBG(2, "Initialization succeeded"); return 0; } static void zc0301_release_resources(struct zc0301_device* cam) { DBG(2, "V4L2 device /dev/video%d deregistered", cam->v4ldev->minor); video_set_drvdata(cam->v4ldev, NULL); video_unregister_device(cam->v4ldev); usb_put_dev(cam->usbdev); kfree(cam->control_buffer); } /*****************************************************************************/ static int zc0301_open(struct inode* inode, struct file* filp) { struct zc0301_device* cam; int err = 0; /* This is the only safe way to prevent race conditions with disconnect */ if (!down_read_trylock(&zc0301_disconnect)) return -ERESTARTSYS; cam = video_get_drvdata(video_devdata(filp)); if (mutex_lock_interruptible(&cam->dev_mutex)) { up_read(&zc0301_disconnect); return -ERESTARTSYS; } if (cam->users) { DBG(2, "Device /dev/video%d is busy...", cam->v4ldev->minor); if ((filp->f_flags & O_NONBLOCK) || (filp->f_flags & O_NDELAY)) { err = -EWOULDBLOCK; goto out; } mutex_unlock(&cam->dev_mutex); err = wait_event_interruptible_exclusive(cam->open, cam->state & DEV_DISCONNECTED || !cam->users); if (err) { up_read(&zc0301_disconnect); return err; } if (cam->state & DEV_DISCONNECTED) { up_read(&zc0301_disconnect); return -ENODEV; } mutex_lock(&cam->dev_mutex); } if (cam->state & DEV_MISCONFIGURED) { err = zc0301_init(cam); if (err) { DBG(1, "Initialization failed again. " "I will retry on next open()."); goto out; } cam->state &= ~DEV_MISCONFIGURED; } if ((err = zc0301_start_transfer(cam))) goto out; filp->private_data = cam; cam->users++; cam->io = IO_NONE; cam->stream = STREAM_OFF; cam->nbuffers = 0; cam->frame_count = 0; zc0301_empty_framequeues(cam); DBG(3, "Video device /dev/video%d is open", cam->v4ldev->minor); out: mutex_unlock(&cam->dev_mutex); up_read(&zc0301_disconnect); return err; } static int zc0301_release(struct inode* inode, struct file* filp) { struct zc0301_device* cam = video_get_drvdata(video_devdata(filp)); mutex_lock(&cam->dev_mutex); /* prevent disconnect() to be called */ zc0301_stop_transfer(cam); zc0301_release_buffers(cam); if (cam->state & DEV_DISCONNECTED) { zc0301_release_resources(cam); mutex_unlock(&cam->dev_mutex); kfree(cam); return 0; } cam->users--; wake_up_interruptible_nr(&cam->open, 1); DBG(3, "Video device /dev/video%d closed", cam->v4ldev->minor); mutex_unlock(&cam->dev_mutex); return 0; } static ssize_t zc0301_read(struct file* filp, char __user * buf, size_t count, loff_t* f_pos) { struct zc0301_device* cam = video_get_drvdata(video_devdata(filp)); struct zc0301_frame_t* f, * i; unsigned long lock_flags; long timeout; int err = 0; if (mutex_lock_interruptible(&cam->fileop_mutex)) return -ERESTARTSYS; if (cam->state & DEV_DISCONNECTED) { DBG(1, "Device not present"); mutex_unlock(&cam->fileop_mutex); return -ENODEV; } if (cam->state & DEV_MISCONFIGURED) { DBG(1, "The camera is misconfigured. Close and open it " "again."); mutex_unlock(&cam->fileop_mutex); return -EIO; } if (cam->io == IO_MMAP) { DBG(3, "Close and open the device again to choose the read " "method"); mutex_unlock(&cam->fileop_mutex); return -EINVAL; } if (cam->io == IO_NONE) { if (!zc0301_request_buffers(cam, cam->nreadbuffers, IO_READ)) { DBG(1, "read() failed, not enough memory"); mutex_unlock(&cam->fileop_mutex); return -ENOMEM; } cam->io = IO_READ; cam->stream = STREAM_ON; } if (list_empty(&cam->inqueue)) { if (!list_empty(&cam->outqueue)) zc0301_empty_framequeues(cam); zc0301_queue_unusedframes(cam); } if (!count) { mutex_unlock(&cam->fileop_mutex); return 0; } if (list_empty(&cam->outqueue)) { if (filp->f_flags & O_NONBLOCK) { mutex_unlock(&cam->fileop_mutex); return -EAGAIN; } timeout = wait_event_interruptible_timeout ( cam->wait_frame, (!list_empty(&cam->outqueue)) || (cam->state & DEV_DISCONNECTED) || (cam->state & DEV_MISCONFIGURED), cam->module_param.frame_timeout * 1000 * msecs_to_jiffies(1) ); if (timeout < 0) { mutex_unlock(&cam->fileop_mutex); return timeout; } if (cam->state & DEV_DISCONNECTED) { mutex_unlock(&cam->fileop_mutex); return -ENODEV; } if (!timeout || (cam->state & DEV_MISCONFIGURED)) { mutex_unlock(&cam->fileop_mutex); return -EIO; } } f = list_entry(cam->outqueue.prev, struct zc0301_frame_t, frame); if (count > f->buf.bytesused) count = f->buf.bytesused; if (copy_to_user(buf, f->bufmem, count)) { err = -EFAULT; goto exit; } *f_pos += count; exit: spin_lock_irqsave(&cam->queue_lock, lock_flags); list_for_each_entry(i, &cam->outqueue, frame) i->state = F_UNUSED; INIT_LIST_HEAD(&cam->outqueue); spin_unlock_irqrestore(&cam->queue_lock, lock_flags); zc0301_queue_unusedframes(cam); PDBGG("Frame #%lu, bytes read: %zu", (unsigned long)f->buf.index, count); mutex_unlock(&cam->fileop_mutex); return err ? err : count; } static unsigned int zc0301_poll(struct file *filp, poll_table *wait) { struct zc0301_device* cam = video_get_drvdata(video_devdata(filp)); struct zc0301_frame_t* f; unsigned long lock_flags; unsigned int mask = 0; if (mutex_lock_interruptible(&cam->fileop_mutex)) return POLLERR; if (cam->state & DEV_DISCONNECTED) { DBG(1, "Device not present"); goto error; } if (cam->state & DEV_MISCONFIGURED) { DBG(1, "The camera is misconfigured. Close and open it " "again."); goto error; } if (cam->io == IO_NONE) { if (!zc0301_request_buffers(cam, cam->nreadbuffers, IO_READ)) { DBG(1, "poll() failed, not enough memory"); goto error; } cam->io = IO_READ; cam->stream = STREAM_ON; } if (cam->io == IO_READ) { spin_lock_irqsave(&cam->queue_lock, lock_flags); list_for_each_entry(f, &cam->outqueue, frame) f->state = F_UNUSED; INIT_LIST_HEAD(&cam->outqueue); spin_unlock_irqrestore(&cam->queue_lock, lock_flags); zc0301_queue_unusedframes(cam); } poll_wait(filp, &cam->wait_frame, wait); if (!list_empty(&cam->outqueue)) mask |= POLLIN | POLLRDNORM; mutex_unlock(&cam->fileop_mutex); return mask; error: mutex_unlock(&cam->fileop_mutex); return POLLERR; } static void zc0301_vm_open(struct vm_area_struct* vma) { struct zc0301_frame_t* f = vma->vm_private_data; f->vma_use_count++; } static void zc0301_vm_close(struct vm_area_struct* vma) { /* NOTE: buffers are not freed here */ struct zc0301_frame_t* f = vma->vm_private_data; f->vma_use_count--; } static struct vm_operations_struct zc0301_vm_ops = { .open = zc0301_vm_open, .close = zc0301_vm_close, }; static int zc0301_mmap(struct file* filp, struct vm_area_struct *vma) { struct zc0301_device* cam = video_get_drvdata(video_devdata(filp)); unsigned long size = vma->vm_end - vma->vm_start, start = vma->vm_start; void *pos; u32 i; if (mutex_lock_interruptible(&cam->fileop_mutex)) return -ERESTARTSYS; if (cam->state & DEV_DISCONNECTED) { DBG(1, "Device not present"); mutex_unlock(&cam->fileop_mutex); return -ENODEV; } if (cam->state & DEV_MISCONFIGURED) { DBG(1, "The camera is misconfigured. Close and open it " "again."); mutex_unlock(&cam->fileop_mutex); return -EIO; } if (cam->io != IO_MMAP || !(vma->vm_flags & VM_WRITE) || size != PAGE_ALIGN(cam->frame[0].buf.length)) { mutex_unlock(&cam->fileop_mutex); return -EINVAL; } for (i = 0; i < cam->nbuffers; i++) { if ((cam->frame[i].buf.m.offset>>PAGE_SHIFT) == vma->vm_pgoff) break; } if (i == cam->nbuffers) { mutex_unlock(&cam->fileop_mutex); return -EINVAL; } vma->vm_flags |= VM_IO; vma->vm_flags |= VM_RESERVED; pos = cam->frame[i].bufmem; while (size > 0) { /* size is page-aligned */ if (vm_insert_page(vma, start, vmalloc_to_page(pos))) { mutex_unlock(&cam->fileop_mutex); return -EAGAIN; } start += PAGE_SIZE; pos += PAGE_SIZE; size -= PAGE_SIZE; } vma->vm_ops = &zc0301_vm_ops; vma->vm_private_data = &cam->frame[i]; zc0301_vm_open(vma); mutex_unlock(&cam->fileop_mutex); return 0; } /*****************************************************************************/ static int zc0301_vidioc_querycap(struct zc0301_device* cam, void __user * arg) { struct v4l2_capability cap = { .driver = "zc0301", .version = ZC0301_MODULE_VERSION_CODE, .capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_READWRITE | V4L2_CAP_STREAMING, }; strlcpy(cap.card, cam->v4ldev->name, sizeof(cap.card)); if (usb_make_path(cam->usbdev, cap.bus_info, sizeof(cap.bus_info)) < 0) strlcpy(cap.bus_info, cam->usbdev->dev.bus_id, sizeof(cap.bus_info)); if (copy_to_user(arg, &cap, sizeof(cap))) return -EFAULT; return 0; } static int zc0301_vidioc_enuminput(struct zc0301_device* cam, void __user * arg) { struct v4l2_input i; if (copy_from_user(&i, arg, sizeof(i))) return -EFAULT; if (i.index) return -EINVAL; memset(&i, 0, sizeof(i)); strcpy(i.name, "Camera"); i.type = V4L2_INPUT_TYPE_CAMERA; if (copy_to_user(arg, &i, sizeof(i))) return -EFAULT; return 0; } static int zc0301_vidioc_g_input(struct zc0301_device* cam, void __user * arg) { int index = 0; if (copy_to_user(arg, &index, sizeof(index))) return -EFAULT; return 0; } static int zc0301_vidioc_s_input(struct zc0301_device* cam, void __user * arg) { int index; if (copy_from_user(&index, arg, sizeof(index))) return -EFAULT; if (index != 0) return -EINVAL; return 0; } static int zc0301_vidioc_query_ctrl(struct zc0301_device* cam, void __user * arg) { struct zc0301_sensor* s = &cam->sensor; struct v4l2_queryctrl qc; u8 i; if (copy_from_user(&qc, arg, sizeof(qc))) return -EFAULT; for (i = 0; i < ARRAY_SIZE(s->qctrl); i++) if (qc.id && qc.id == s->qctrl[i].id) { memcpy(&qc, &(s->qctrl[i]), sizeof(qc)); if (copy_to_user(arg, &qc, sizeof(qc))) return -EFAULT; return 0; } return -EINVAL; } static int zc0301_vidioc_g_ctrl(struct zc0301_device* cam, void __user * arg) { struct zc0301_sensor* s = &cam->sensor; struct v4l2_control ctrl; int err = 0; u8 i; if (!s->get_ctrl && !s->set_ctrl) return -EINVAL; if (copy_from_user(&ctrl, arg, sizeof(ctrl))) return -EFAULT; if (!s->get_ctrl) { for (i = 0; i < ARRAY_SIZE(s->qctrl); i++) if (ctrl.id == s->qctrl[i].id) { ctrl.value = s->_qctrl[i].default_value; goto exit; } return -EINVAL; } else err = s->get_ctrl(cam, &ctrl); exit: if (copy_to_user(arg, &ctrl, sizeof(ctrl))) return -EFAULT; return err; } static int zc0301_vidioc_s_ctrl(struct zc0301_device* cam, void __user * arg) { struct zc0301_sensor* s = &cam->sensor; struct v4l2_control ctrl; u8 i; int err = 0; if (!s->set_ctrl) return -EINVAL; if (copy_from_user(&ctrl, arg, sizeof(ctrl))) return -EFAULT; for (i = 0; i < ARRAY_SIZE(s->qctrl); i++) if (ctrl.id == s->qctrl[i].id) { if (s->qctrl[i].flags & V4L2_CTRL_FLAG_DISABLED) return -EINVAL; if (ctrl.value < s->qctrl[i].minimum || ctrl.value > s->qctrl[i].maximum) return -ERANGE; ctrl.value -= ctrl.value % s->qctrl[i].step; break; } if ((err = s->set_ctrl(cam, &ctrl))) return err; s->_qctrl[i].default_value = ctrl.value; return 0; } static int zc0301_vidioc_cropcap(struct zc0301_device* cam, void __user * arg) { struct v4l2_cropcap* cc = &(cam->sensor.cropcap); cc->type = V4L2_BUF_TYPE_VIDEO_CAPTURE; cc->pixelaspect.numerator = 1; cc->pixelaspect.denominator = 1; if (copy_to_user(arg, cc, sizeof(*cc))) return -EFAULT; return 0; } static int zc0301_vidioc_g_crop(struct zc0301_device* cam, void __user * arg) { struct zc0301_sensor* s = &cam->sensor; struct v4l2_crop crop = { .type = V4L2_BUF_TYPE_VIDEO_CAPTURE, }; memcpy(&(crop.c), &(s->_rect), sizeof(struct v4l2_rect)); if (copy_to_user(arg, &crop, sizeof(crop))) return -EFAULT; return 0; } static int zc0301_vidioc_s_crop(struct zc0301_device* cam, void __user * arg) { struct zc0301_sensor* s = &cam->sensor; struct v4l2_crop crop; struct v4l2_rect* rect; struct v4l2_rect* bounds = &(s->cropcap.bounds); const enum zc0301_stream_state stream = cam->stream; const u32 nbuffers = cam->nbuffers; u32 i; int err = 0; if (copy_from_user(&crop, arg, sizeof(crop))) return -EFAULT; rect = &(crop.c); if (crop.type != V4L2_BUF_TYPE_VIDEO_CAPTURE) return -EINVAL; if (cam->module_param.force_munmap) for (i = 0; i < cam->nbuffers; i++) if (cam->frame[i].vma_use_count) { DBG(3, "VIDIOC_S_CROP failed. " "Unmap the buffers first."); return -EINVAL; } if (!s->set_crop) { memcpy(rect, &(s->_rect), sizeof(*rect)); if (copy_to_user(arg, &crop, sizeof(crop))) return -EFAULT; return 0; } rect->left &= ~7L; rect->top &= ~7L; if (rect->width < 8) rect->width = 8; if (rect->height < 8) rect->height = 8; if (rect->width > bounds->width) rect->width = bounds->width; if (rect->height > bounds->height) rect->height = bounds->height; if (rect->left < bounds->left) rect->left = bounds->left; if (rect->top < bounds->top) rect->top = bounds->top; if (rect->left + rect->width > bounds->left + bounds->width) rect->left = bounds->left+bounds->width - rect->width; if (rect->top + rect->height > bounds->top + bounds->height) rect->top = bounds->top+bounds->height - rect->height; rect->width &= ~7L; rect->height &= ~7L; if (cam->stream == STREAM_ON) if ((err = zc0301_stream_interrupt(cam))) return err; if (copy_to_user(arg, &crop, sizeof(crop))) { cam->stream = stream; return -EFAULT; } if (cam->module_param.force_munmap || cam->io == IO_READ) zc0301_release_buffers(cam); if (s->set_crop) err += s->set_crop(cam, rect); if (err) { /* atomic, no rollback in ioctl() */ cam->state |= DEV_MISCONFIGURED; DBG(1, "VIDIOC_S_CROP failed because of hardware problems. To " "use the camera, close and open /dev/video%d again.", cam->v4ldev->minor); return -EIO; } s->pix_format.width = rect->width; s->pix_format.height = rect->height; memcpy(&(s->_rect), rect, sizeof(*rect)); if ((cam->module_param.force_munmap || cam->io == IO_READ) && nbuffers != zc0301_request_buffers(cam, nbuffers, cam->io)) { cam->state |= DEV_MISCONFIGURED; DBG(1, "VIDIOC_S_CROP failed because of not enough memory. To " "use the camera, close and open /dev/video%d again.", cam->v4ldev->minor); return -ENOMEM; } if (cam->io == IO_READ) zc0301_empty_framequeues(cam); else if (cam->module_param.force_munmap) zc0301_requeue_outqueue(cam); cam->stream = stream; return 0; } static int zc0301_vidioc_enum_fmt(struct zc0301_device* cam, void __user * arg) { struct v4l2_fmtdesc fmtd; if (copy_from_user(&fmtd, arg, sizeof(fmtd))) return -EFAULT; if (fmtd.index == 0) { strcpy(fmtd.description, "JPEG"); fmtd.pixelformat = V4L2_PIX_FMT_JPEG; fmtd.flags = V4L2_FMT_FLAG_COMPRESSED; } else return -EINVAL; fmtd.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; memset(&fmtd.reserved, 0, sizeof(fmtd.reserved)); if (copy_to_user(arg, &fmtd, sizeof(fmtd))) return -EFAULT; return 0; } static int zc0301_vidioc_g_fmt(struct zc0301_device* cam, void __user * arg) { struct v4l2_format format; struct v4l2_pix_format* pfmt = &(cam->sensor.pix_format); if (copy_from_user(&format, arg, sizeof(format))) return -EFAULT; if (format.type != V4L2_BUF_TYPE_VIDEO_CAPTURE) return -EINVAL; pfmt->bytesperline = 0; pfmt->sizeimage = pfmt->height * ((pfmt->width*pfmt->priv)/8); pfmt->field = V4L2_FIELD_NONE; memcpy(&(format.fmt.pix), pfmt, sizeof(*pfmt)); if (copy_to_user(arg, &format, sizeof(format))) return -EFAULT; return 0; } static int zc0301_vidioc_try_s_fmt(struct zc0301_device* cam, unsigned int cmd, void __user * arg) { struct zc0301_sensor* s = &cam->sensor; struct v4l2_format format; struct v4l2_pix_format* pix; struct v4l2_pix_format* pfmt = &(s->pix_format); struct v4l2_rect* bounds = &(s->cropcap.bounds); struct v4l2_rect rect; const enum zc0301_stream_state stream = cam->stream; const u32 nbuffers = cam->nbuffers; u32 i; int err = 0; if (copy_from_user(&format, arg, sizeof(format))) return -EFAULT; pix = &(format.fmt.pix); if (format.type != V4L2_BUF_TYPE_VIDEO_CAPTURE) return -EINVAL; memcpy(&rect, &(s->_rect), sizeof(rect)); if (!s->set_crop) { pix->width = rect.width; pix->height = rect.height; } else { rect.width = pix->width; rect.height = pix->height; } if (rect.width < 8) rect.width = 8; if (rect.height < 8) rect.height = 8; if (rect.width > bounds->left + bounds->width - rect.left) rect.width = bounds->left + bounds->width - rect.left; if (rect.height > bounds->top + bounds->height - rect.top) rect.height = bounds->top + bounds->height - rect.top; rect.width &= ~7L; rect.height &= ~7L; pix->width = rect.width; pix->height = rect.height; pix->pixelformat = pfmt->pixelformat; pix->priv = pfmt->priv; pix->colorspace = pfmt->colorspace; pix->bytesperline = 0; pix->sizeimage = pix->height * ((pix->width * pix->priv) / 8); pix->field = V4L2_FIELD_NONE; if (cmd == VIDIOC_TRY_FMT) { if (copy_to_user(arg, &format, sizeof(format))) return -EFAULT; return 0; } if (cam->module_param.force_munmap) for (i = 0; i < cam->nbuffers; i++) if (cam->frame[i].vma_use_count) { DBG(3, "VIDIOC_S_FMT failed. " "Unmap the buffers first."); return -EINVAL; } if (cam->stream == STREAM_ON) if ((err = zc0301_stream_interrupt(cam))) return err; if (copy_to_user(arg, &format, sizeof(format))) { cam->stream = stream; return -EFAULT; } if (cam->module_param.force_munmap || cam->io == IO_READ) zc0301_release_buffers(cam); if (s->set_crop) err += s->set_crop(cam, &rect); if (err) { /* atomic, no rollback in ioctl() */ cam->state |= DEV_MISCONFIGURED; DBG(1, "VIDIOC_S_FMT failed because of hardware problems. To " "use the camera, close and open /dev/video%d again.", cam->v4ldev->minor); return -EIO; } memcpy(pfmt, pix, sizeof(*pix)); memcpy(&(s->_rect), &rect, sizeof(rect)); if ((cam->module_param.force_munmap || cam->io == IO_READ) && nbuffers != zc0301_request_buffers(cam, nbuffers, cam->io)) { cam->state |= DEV_MISCONFIGURED; DBG(1, "VIDIOC_S_FMT failed because of not enough memory. To " "use the camera, close and open /dev/video%d again.", cam->v4ldev->minor); return -ENOMEM; } if (cam->io == IO_READ) zc0301_empty_framequeues(cam); else if (cam->module_param.force_munmap) zc0301_requeue_outqueue(cam); cam->stream = stream; return 0; } static int zc0301_vidioc_g_jpegcomp(struct zc0301_device* cam, void __user * arg) { if (copy_to_user(arg, &cam->compression, sizeof(cam->compression))) return -EFAULT; return 0; } static int zc0301_vidioc_s_jpegcomp(struct zc0301_device* cam, void __user * arg) { struct v4l2_jpegcompression jc; const enum zc0301_stream_state stream = cam->stream; int err = 0; if (copy_from_user(&jc, arg, sizeof(jc))) return -EFAULT; if (jc.quality != 0) return -EINVAL; if (cam->stream == STREAM_ON) if ((err = zc0301_stream_interrupt(cam))) return err; err += zc0301_set_compression(cam, &jc); if (err) { /* atomic, no rollback in ioctl() */ cam->state |= DEV_MISCONFIGURED; DBG(1, "VIDIOC_S_JPEGCOMP failed because of hardware " "problems. To use the camera, close and open " "/dev/video%d again.", cam->v4ldev->minor); return -EIO; } cam->compression.quality = jc.quality; cam->stream = stream; return 0; } static int zc0301_vidioc_reqbufs(struct zc0301_device* cam, void __user * arg) { struct v4l2_requestbuffers rb; u32 i; int err; if (copy_from_user(&rb, arg, sizeof(rb))) return -EFAULT; if (rb.type != V4L2_BUF_TYPE_VIDEO_CAPTURE || rb.memory != V4L2_MEMORY_MMAP) return -EINVAL; if (cam->io == IO_READ) { DBG(3, "Close and open the device again to choose the mmap " "I/O method"); return -EINVAL; } for (i = 0; i < cam->nbuffers; i++) if (cam->frame[i].vma_use_count) { DBG(3, "VIDIOC_REQBUFS failed. " "Previous buffers are still mapped."); return -EINVAL; } if (cam->stream == STREAM_ON) if ((err = zc0301_stream_interrupt(cam))) return err; zc0301_empty_framequeues(cam); zc0301_release_buffers(cam); if (rb.count) rb.count = zc0301_request_buffers(cam, rb.count, IO_MMAP); if (copy_to_user(arg, &rb, sizeof(rb))) { zc0301_release_buffers(cam); cam->io = IO_NONE; return -EFAULT; } cam->io = rb.count ? IO_MMAP : IO_NONE; return 0; } static int zc0301_vidioc_querybuf(struct zc0301_device* cam, void __user * arg) { struct v4l2_buffer b; if (copy_from_user(&b, arg, sizeof(b))) return -EFAULT; if (b.type != V4L2_BUF_TYPE_VIDEO_CAPTURE || b.index >= cam->nbuffers || cam->io != IO_MMAP) return -EINVAL; memcpy(&b, &cam->frame[b.index].buf, sizeof(b)); if (cam->frame[b.index].vma_use_count) b.flags |= V4L2_BUF_FLAG_MAPPED; if (cam->frame[b.index].state == F_DONE) b.flags |= V4L2_BUF_FLAG_DONE; else if (cam->frame[b.index].state != F_UNUSED) b.flags |= V4L2_BUF_FLAG_QUEUED; if (copy_to_user(arg, &b, sizeof(b))) return -EFAULT; return 0; } static int zc0301_vidioc_qbuf(struct zc0301_device* cam, void __user * arg) { struct v4l2_buffer b; unsigned long lock_flags; if (copy_from_user(&b, arg, sizeof(b))) return -EFAULT; if (b.type != V4L2_BUF_TYPE_VIDEO_CAPTURE || b.index >= cam->nbuffers || cam->io != IO_MMAP) return -EINVAL; if (cam->frame[b.index].state != F_UNUSED) return -EINVAL; cam->frame[b.index].state = F_QUEUED; spin_lock_irqsave(&cam->queue_lock, lock_flags); list_add_tail(&cam->frame[b.index].frame, &cam->inqueue); spin_unlock_irqrestore(&cam->queue_lock, lock_flags); PDBGG("Frame #%lu queued", (unsigned long)b.index); return 0; } static int zc0301_vidioc_dqbuf(struct zc0301_device* cam, struct file* filp, void __user * arg) { struct v4l2_buffer b; struct zc0301_frame_t *f; unsigned long lock_flags; long timeout; if (copy_from_user(&b, arg, sizeof(b))) return -EFAULT; if (b.type != V4L2_BUF_TYPE_VIDEO_CAPTURE || cam->io!= IO_MMAP) return -EINVAL; if (list_empty(&cam->outqueue)) { if (cam->stream == STREAM_OFF) return -EINVAL; if (filp->f_flags & O_NONBLOCK) return -EAGAIN; timeout = wait_event_interruptible_timeout ( cam->wait_frame, (!list_empty(&cam->outqueue)) || (cam->state & DEV_DISCONNECTED) || (cam->state & DEV_MISCONFIGURED), cam->module_param.frame_timeout * 1000 * msecs_to_jiffies(1) ); if (timeout < 0) return timeout; if (cam->state & DEV_DISCONNECTED) return -ENODEV; if (!timeout || (cam->state & DEV_MISCONFIGURED)) return -EIO; } spin_lock_irqsave(&cam->queue_lock, lock_flags); f = list_entry(cam->outqueue.next, struct zc0301_frame_t, frame); list_del(cam->outqueue.next); spin_unlock_irqrestore(&cam->queue_lock, lock_flags); f->state = F_UNUSED; memcpy(&b, &f->buf, sizeof(b)); if (f->vma_use_count) b.flags |= V4L2_BUF_FLAG_MAPPED; if (copy_to_user(arg, &b, sizeof(b))) return -EFAULT; PDBGG("Frame #%lu dequeued", (unsigned long)f->buf.index); return 0; } static int zc0301_vidioc_streamon(struct zc0301_device* cam, void __user * arg) { int type; if (copy_from_user(&type, arg, sizeof(type))) return -EFAULT; if (type != V4L2_BUF_TYPE_VIDEO_CAPTURE || cam->io != IO_MMAP) return -EINVAL; if (list_empty(&cam->inqueue)) return -EINVAL; cam->stream = STREAM_ON; DBG(3, "Stream on"); return 0; } static int zc0301_vidioc_streamoff(struct zc0301_device* cam, void __user * arg) { int type, err; if (copy_from_user(&type, arg, sizeof(type))) return -EFAULT; if (type != V4L2_BUF_TYPE_VIDEO_CAPTURE || cam->io != IO_MMAP) return -EINVAL; if (cam->stream == STREAM_ON) if ((err = zc0301_stream_interrupt(cam))) return err; zc0301_empty_framequeues(cam); DBG(3, "Stream off"); return 0; } static int zc0301_vidioc_g_parm(struct zc0301_device* cam, void __user * arg) { struct v4l2_streamparm sp; if (copy_from_user(&sp, arg, sizeof(sp))) return -EFAULT; if (sp.type != V4L2_BUF_TYPE_VIDEO_CAPTURE) return -EINVAL; sp.parm.capture.extendedmode = 0; sp.parm.capture.readbuffers = cam->nreadbuffers; if (copy_to_user(arg, &sp, sizeof(sp))) return -EFAULT; return 0; } static int zc0301_vidioc_s_parm(struct zc0301_device* cam, void __user * arg) { struct v4l2_streamparm sp; if (copy_from_user(&sp, arg, sizeof(sp))) return -EFAULT; if (sp.type != V4L2_BUF_TYPE_VIDEO_CAPTURE) return -EINVAL; sp.parm.capture.extendedmode = 0; if (sp.parm.capture.readbuffers == 0) sp.parm.capture.readbuffers = cam->nreadbuffers; if (sp.parm.capture.readbuffers > ZC0301_MAX_FRAMES) sp.parm.capture.readbuffers = ZC0301_MAX_FRAMES; if (copy_to_user(arg, &sp, sizeof(sp))) return -EFAULT; cam->nreadbuffers = sp.parm.capture.readbuffers; return 0; } static int zc0301_ioctl_v4l2(struct inode* inode, struct file* filp, unsigned int cmd, void __user * arg) { struct zc0301_device* cam = video_get_drvdata(video_devdata(filp)); switch (cmd) { case VIDIOC_QUERYCAP: return zc0301_vidioc_querycap(cam, arg); case VIDIOC_ENUMINPUT: return zc0301_vidioc_enuminput(cam, arg); case VIDIOC_G_INPUT: return zc0301_vidioc_g_input(cam, arg); case VIDIOC_S_INPUT: return zc0301_vidioc_s_input(cam, arg); case VIDIOC_QUERYCTRL: return zc0301_vidioc_query_ctrl(cam, arg); case VIDIOC_G_CTRL: return zc0301_vidioc_g_ctrl(cam, arg); case VIDIOC_S_CTRL_OLD: case VIDIOC_S_CTRL: return zc0301_vidioc_s_ctrl(cam, arg); case VIDIOC_CROPCAP_OLD: case VIDIOC_CROPCAP: return zc0301_vidioc_cropcap(cam, arg); case VIDIOC_G_CROP: return zc0301_vidioc_g_crop(cam, arg); case VIDIOC_S_CROP: return zc0301_vidioc_s_crop(cam, arg); case VIDIOC_ENUM_FMT: return zc0301_vidioc_enum_fmt(cam, arg); case VIDIOC_G_FMT: return zc0301_vidioc_g_fmt(cam, arg); case VIDIOC_TRY_FMT: case VIDIOC_S_FMT: return zc0301_vidioc_try_s_fmt(cam, cmd, arg); case VIDIOC_G_JPEGCOMP: return zc0301_vidioc_g_jpegcomp(cam, arg); case VIDIOC_S_JPEGCOMP: return zc0301_vidioc_s_jpegcomp(cam, arg); case VIDIOC_REQBUFS: return zc0301_vidioc_reqbufs(cam, arg); case VIDIOC_QUERYBUF: return zc0301_vidioc_querybuf(cam, arg); case VIDIOC_QBUF: return zc0301_vidioc_qbuf(cam, arg); case VIDIOC_DQBUF: return zc0301_vidioc_dqbuf(cam, filp, arg); case VIDIOC_STREAMON: return zc0301_vidioc_streamon(cam, arg); case VIDIOC_STREAMOFF: return zc0301_vidioc_streamoff(cam, arg); case VIDIOC_G_PARM: return zc0301_vidioc_g_parm(cam, arg); case VIDIOC_S_PARM_OLD: case VIDIOC_S_PARM: return zc0301_vidioc_s_parm(cam, arg); case VIDIOC_G_STD: case VIDIOC_S_STD: case VIDIOC_QUERYSTD: case VIDIOC_ENUMSTD: case VIDIOC_QUERYMENU: return -EINVAL; default: return -EINVAL; } } static int zc0301_ioctl(struct inode* inode, struct file* filp, unsigned int cmd, unsigned long arg) { struct zc0301_device* cam = video_get_drvdata(video_devdata(filp)); int err = 0; if (mutex_lock_interruptible(&cam->fileop_mutex)) return -ERESTARTSYS; if (cam->state & DEV_DISCONNECTED) { DBG(1, "Device not present"); mutex_unlock(&cam->fileop_mutex); return -ENODEV; } if (cam->state & DEV_MISCONFIGURED) { DBG(1, "The camera is misconfigured. Close and open it " "again."); mutex_unlock(&cam->fileop_mutex); return -EIO; } V4LDBG(3, "zc0301", cmd); err = zc0301_ioctl_v4l2(inode, filp, cmd, (void __user *)arg); mutex_unlock(&cam->fileop_mutex); return err; } static struct file_operations zc0301_fops = { .owner = THIS_MODULE, .open = zc0301_open, .release = zc0301_release, .ioctl = zc0301_ioctl, .read = zc0301_read, .poll = zc0301_poll, .mmap = zc0301_mmap, .llseek = no_llseek, }; /*****************************************************************************/ static int zc0301_usb_probe(struct usb_interface* intf, const struct usb_device_id* id) { struct usb_device *udev = interface_to_usbdev(intf); struct zc0301_device* cam; static unsigned int dev_nr = 0; unsigned int i; int err = 0; if (!(cam = kzalloc(sizeof(struct zc0301_device), GFP_KERNEL))) return -ENOMEM; cam->usbdev = udev; if (!(cam->control_buffer = kzalloc(4, GFP_KERNEL))) { DBG(1, "kmalloc() failed"); err = -ENOMEM; goto fail; } if (!(cam->v4ldev = video_device_alloc())) { DBG(1, "video_device_alloc() failed"); err = -ENOMEM; goto fail; } mutex_init(&cam->dev_mutex); DBG(2, "ZC0301 Image Processor and Control Chip detected " "(vid/pid 0x%04X/0x%04X)",id->idVendor, id->idProduct); for (i = 0; zc0301_sensor_table[i]; i++) { err = zc0301_sensor_table[i](cam); if (!err) break; } if (!err) DBG(2, "%s image sensor detected", cam->sensor.name); else { DBG(1, "No supported image sensor detected"); err = -ENODEV; goto fail; } if (zc0301_init(cam)) { DBG(1, "Initialization failed. I will retry on open()."); cam->state |= DEV_MISCONFIGURED; } strcpy(cam->v4ldev->name, "ZC0301 PC Camera"); cam->v4ldev->owner = THIS_MODULE; cam->v4ldev->type = VID_TYPE_CAPTURE | VID_TYPE_SCALES; cam->v4ldev->hardware = 0; cam->v4ldev->fops = &zc0301_fops; cam->v4ldev->minor = video_nr[dev_nr]; cam->v4ldev->release = video_device_release; video_set_drvdata(cam->v4ldev, cam); mutex_lock(&cam->dev_mutex); err = video_register_device(cam->v4ldev, VFL_TYPE_GRABBER, video_nr[dev_nr]); if (err) { DBG(1, "V4L2 device registration failed"); if (err == -ENFILE && video_nr[dev_nr] == -1) DBG(1, "Free /dev/videoX node not found"); video_nr[dev_nr] = -1; dev_nr = (dev_nr < ZC0301_MAX_DEVICES-1) ? dev_nr+1 : 0; mutex_unlock(&cam->dev_mutex); goto fail; } DBG(2, "V4L2 device registered as /dev/video%d", cam->v4ldev->minor); cam->module_param.force_munmap = force_munmap[dev_nr]; cam->module_param.frame_timeout = frame_timeout[dev_nr]; dev_nr = (dev_nr < ZC0301_MAX_DEVICES-1) ? dev_nr+1 : 0; usb_set_intfdata(intf, cam); mutex_unlock(&cam->dev_mutex); return 0; fail: if (cam) { kfree(cam->control_buffer); if (cam->v4ldev) video_device_release(cam->v4ldev); kfree(cam); } return err; } static void zc0301_usb_disconnect(struct usb_interface* intf) { struct zc0301_device* cam = usb_get_intfdata(intf); if (!cam) return; down_write(&zc0301_disconnect); mutex_lock(&cam->dev_mutex); DBG(2, "Disconnecting %s...", cam->v4ldev->name); wake_up_interruptible_all(&cam->open); if (cam->users) { DBG(2, "Device /dev/video%d is open! Deregistration and " "memory deallocation are deferred on close.", cam->v4ldev->minor); cam->state |= DEV_MISCONFIGURED; zc0301_stop_transfer(cam); cam->state |= DEV_DISCONNECTED; wake_up_interruptible(&cam->wait_frame); wake_up(&cam->wait_stream); usb_get_dev(cam->usbdev); } else { cam->state |= DEV_DISCONNECTED; zc0301_release_resources(cam); } mutex_unlock(&cam->dev_mutex); if (!cam->users) kfree(cam); up_write(&zc0301_disconnect); } static struct usb_driver zc0301_usb_driver = { .name = "zc0301", .id_table = zc0301_id_table, .probe = zc0301_usb_probe, .disconnect = zc0301_usb_disconnect, }; /*****************************************************************************/ static int __init zc0301_module_init(void) { int err = 0; KDBG(2, ZC0301_MODULE_NAME " v" ZC0301_MODULE_VERSION); KDBG(3, ZC0301_MODULE_AUTHOR); if ((err = usb_register(&zc0301_usb_driver))) KDBG(1, "usb_register() failed"); return err; } static void __exit zc0301_module_exit(void) { usb_deregister(&zc0301_usb_driver); } module_init(zc0301_module_init); module_exit(zc0301_module_exit);