diff options
Diffstat (limited to 'drivers/media/video/gspca/gspca.c')
| -rw-r--r-- | drivers/media/video/gspca/gspca.c | 1905 |
1 files changed, 1905 insertions, 0 deletions
diff --git a/drivers/media/video/gspca/gspca.c b/drivers/media/video/gspca/gspca.c new file mode 100644 index 000000000000..16e367cec760 --- /dev/null +++ b/drivers/media/video/gspca/gspca.c @@ -0,0 +1,1905 @@ +/* + * Main USB camera driver + * + * V4L2 by Jean-Francois Moine <http://moinejf.free.fr> + * + * 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. + */ + +#define MODULE_NAME "gspca" + +#include <linux/init.h> +#include <linux/fs.h> +#include <linux/vmalloc.h> +#include <linux/sched.h> +#include <linux/slab.h> +#include <linux/mm.h> +#include <linux/string.h> +#include <linux/pagemap.h> +#include <linux/io.h> +#include <asm/page.h> +#include <linux/uaccess.h> +#include <linux/jiffies.h> + +#include "gspca.h" + +/* global values */ +#define DEF_NURBS 2 /* default number of URBs */ + +MODULE_AUTHOR("Jean-Francois Moine <http://moinejf.free.fr>"); +MODULE_DESCRIPTION("GSPCA USB Camera Driver"); +MODULE_LICENSE("GPL"); + +#define DRIVER_VERSION_NUMBER KERNEL_VERSION(2, 1, 7) +static const char version[] = "2.1.7"; + +static int video_nr = -1; + +#ifdef CONFIG_VIDEO_ADV_DEBUG +int gspca_debug = D_ERR | D_PROBE; +EXPORT_SYMBOL(gspca_debug); + +static void PDEBUG_MODE(char *txt, __u32 pixfmt, int w, int h) +{ + if ((pixfmt >> 24) >= '0' && (pixfmt >> 24) <= 'z') { + PDEBUG(D_CONF|D_STREAM, "%s %c%c%c%c %dx%d", + txt, + pixfmt & 0xff, + (pixfmt >> 8) & 0xff, + (pixfmt >> 16) & 0xff, + pixfmt >> 24, + w, h); + } else { + PDEBUG(D_CONF|D_STREAM, "%s 0x%08x %dx%d", + txt, + pixfmt, + w, h); + } +} +#else +#define PDEBUG_MODE(txt, pixfmt, w, h) +#endif + +/* specific memory types - !! should different from V4L2_MEMORY_xxx */ +#define GSPCA_MEMORY_NO 0 /* V4L2_MEMORY_xxx starts from 1 */ +#define GSPCA_MEMORY_READ 7 + +#define BUF_ALL_FLAGS (V4L2_BUF_FLAG_QUEUED | V4L2_BUF_FLAG_DONE) + +/* + * VMA operations. + */ +static void gspca_vm_open(struct vm_area_struct *vma) +{ + struct gspca_frame *frame = vma->vm_private_data; + + frame->vma_use_count++; + frame->v4l2_buf.flags |= V4L2_BUF_FLAG_MAPPED; +} + +static void gspca_vm_close(struct vm_area_struct *vma) +{ + struct gspca_frame *frame = vma->vm_private_data; + + if (--frame->vma_use_count <= 0) + frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_MAPPED; +} + +static struct vm_operations_struct gspca_vm_ops = { + .open = gspca_vm_open, + .close = gspca_vm_close, +}; + +/* + * fill a video frame from an URB and resubmit + */ +static void fill_frame(struct gspca_dev *gspca_dev, + struct urb *urb) +{ + struct gspca_frame *frame; + __u8 *data; /* address of data in the iso message */ + int i, j, len, st; + cam_pkt_op pkt_scan; + + if (urb->status != 0) { + PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status); + return; /* disconnection ? */ + } + pkt_scan = gspca_dev->sd_desc->pkt_scan; + for (i = 0; i < urb->number_of_packets; i++) { + + /* check the availability of the frame buffer */ + j = gspca_dev->fr_i; + j = gspca_dev->fr_queue[j]; + frame = &gspca_dev->frame[j]; + if ((frame->v4l2_buf.flags & BUF_ALL_FLAGS) + != V4L2_BUF_FLAG_QUEUED) { + gspca_dev->last_packet_type = DISCARD_PACKET; + break; + } + + /* check the packet status and length */ + len = urb->iso_frame_desc[i].actual_length; + if (len == 0) + continue; + st = urb->iso_frame_desc[i].status; + if (st) { + PDEBUG(D_ERR, + "ISOC data error: [%d] len=%d, status=%d", + i, len, st); + gspca_dev->last_packet_type = DISCARD_PACKET; + continue; + } + + /* let the packet be analyzed by the subdriver */ + PDEBUG(D_PACK, "packet [%d] o:%d l:%d", + i, urb->iso_frame_desc[i].offset, len); + data = (__u8 *) urb->transfer_buffer + + urb->iso_frame_desc[i].offset; + pkt_scan(gspca_dev, frame, data, len); + } + + /* resubmit the URB */ + urb->status = 0; + st = usb_submit_urb(urb, GFP_ATOMIC); + if (st < 0) + PDEBUG(D_ERR|D_PACK, "usb_submit_urb() ret %d", st); +} + +/* + * ISOC message interrupt from the USB device + * + * Analyse each packet and call the subdriver for copy to the frame buffer. + */ +static void isoc_irq(struct urb *urb +) +{ + struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context; + + PDEBUG(D_PACK, "isoc irq"); + if (!gspca_dev->streaming) + return; + fill_frame(gspca_dev, urb); +} + +/* + * add data to the current frame + * + * This function is called by the subdrivers at interrupt level. + * + * To build a frame, these ones must add + * - one FIRST_PACKET + * - 0 or many INTER_PACKETs + * - one LAST_PACKET + * DISCARD_PACKET invalidates the whole frame. + * On LAST_PACKET, a new frame is returned. + */ +struct gspca_frame *gspca_frame_add(struct gspca_dev *gspca_dev, + int packet_type, + struct gspca_frame *frame, + const __u8 *data, + int len) +{ + int i, j; + + PDEBUG(D_PACK, "add t:%d l:%d", packet_type, len); + + /* when start of a new frame, if the current frame buffer + * is not queued, discard the whole frame */ + if (packet_type == FIRST_PACKET) { + if ((frame->v4l2_buf.flags & BUF_ALL_FLAGS) + != V4L2_BUF_FLAG_QUEUED) { + gspca_dev->last_packet_type = DISCARD_PACKET; + return frame; + } + frame->data_end = frame->data; + jiffies_to_timeval(get_jiffies_64(), + &frame->v4l2_buf.timestamp); + frame->v4l2_buf.sequence = ++gspca_dev->sequence; + } else if (gspca_dev->last_packet_type == DISCARD_PACKET) { + return frame; + } + + /* append the packet to the frame buffer */ + if (len > 0) { + if (frame->data_end - frame->data + len + > frame->v4l2_buf.length) { + PDEBUG(D_ERR|D_PACK, "frame overflow %zd > %d", + frame->data_end - frame->data + len, + frame->v4l2_buf.length); + packet_type = DISCARD_PACKET; + } else { + memcpy(frame->data_end, data, len); + frame->data_end += len; + } + } + gspca_dev->last_packet_type = packet_type; + + /* if last packet, wake the application and advance in the queue */ + if (packet_type == LAST_PACKET) { + frame->v4l2_buf.bytesused = frame->data_end - frame->data; + frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_QUEUED; + frame->v4l2_buf.flags |= V4L2_BUF_FLAG_DONE; + atomic_inc(&gspca_dev->nevent); + wake_up_interruptible(&gspca_dev->wq); /* event = new frame */ + i = (gspca_dev->fr_i + 1) % gspca_dev->nframes; + gspca_dev->fr_i = i; + PDEBUG(D_FRAM, "frame complete len:%d q:%d i:%d o:%d", + frame->v4l2_buf.bytesused, + gspca_dev->fr_q, + i, + gspca_dev->fr_o); + j = gspca_dev->fr_queue[i]; + frame = &gspca_dev->frame[j]; + } + return frame; +} +EXPORT_SYMBOL(gspca_frame_add); + +static int gspca_is_compressed(__u32 format) +{ + switch (format) { + case V4L2_PIX_FMT_MJPEG: + case V4L2_PIX_FMT_JPEG: + case V4L2_PIX_FMT_SPCA561: + case V4L2_PIX_FMT_PAC207: + return 1; + } + return 0; +} + +static void *rvmalloc(unsigned long size) +{ + void *mem; + unsigned long adr; + +/* size = PAGE_ALIGN(size); (already done) */ + mem = vmalloc_32(size); + if (mem != NULL) { + adr = (unsigned long) mem; + while ((long) size > 0) { + SetPageReserved(vmalloc_to_page((void *) adr)); + adr += PAGE_SIZE; + size -= PAGE_SIZE; + } + } + return mem; +} + +static void rvfree(void *mem, long size) +{ + unsigned long adr; + + adr = (unsigned long) mem; + while (size > 0) { + ClearPageReserved(vmalloc_to_page((void *) adr)); + adr += PAGE_SIZE; + size -= PAGE_SIZE; + } + vfree(mem); +} + +static int frame_alloc(struct gspca_dev *gspca_dev, + unsigned int count) +{ + struct gspca_frame *frame; + unsigned int frsz; + int i; + + i = gspca_dev->curr_mode; + frsz = gspca_dev->cam.cam_mode[i].sizeimage; + PDEBUG(D_STREAM, "frame alloc frsz: %d", frsz); + frsz = PAGE_ALIGN(frsz); + gspca_dev->frsz = frsz; + if (count > GSPCA_MAX_FRAMES) + count = GSPCA_MAX_FRAMES; + gspca_dev->frbuf = rvmalloc(frsz * count); + if (!gspca_dev->frbuf) { + err("frame alloc failed"); + return -ENOMEM; + } + gspca_dev->nframes = count; + for (i = 0; i < count; i++) { + frame = &gspca_dev->frame[i]; + frame->v4l2_buf.index = i; + frame->v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; + frame->v4l2_buf.flags = 0; + frame->v4l2_buf.field = V4L2_FIELD_NONE; + frame->v4l2_buf.length = frsz; + frame->v4l2_buf.memory = gspca_dev->memory; + frame->v4l2_buf.sequence = 0; + frame->data = frame->data_end = + gspca_dev->frbuf + i * frsz; + frame->v4l2_buf.m.offset = i * frsz; + } + gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0; + gspca_dev->last_packet_type = DISCARD_PACKET; + gspca_dev->sequence = 0; + atomic_set(&gspca_dev->nevent, 0); + return 0; +} + +static void frame_free(struct gspca_dev *gspca_dev) +{ + int i; + + PDEBUG(D_STREAM, "frame free"); + if (gspca_dev->frbuf != NULL) { + rvfree(gspca_dev->frbuf, + gspca_dev->nframes * gspca_dev->frsz); + gspca_dev->frbuf = NULL; + for (i = 0; i < gspca_dev->nframes; i++) + gspca_dev->frame[i].data = NULL; + } + gspca_dev->nframes = 0; +} + +static void destroy_urbs(struct gspca_dev *gspca_dev) +{ + struct urb *urb; + unsigned int i; + + PDEBUG(D_STREAM, "kill transfer"); + for (i = 0; i < MAX_NURBS; ++i) { + urb = gspca_dev->urb[i]; + if (urb == NULL) + break; + + gspca_dev->urb[i] = NULL; + usb_kill_urb(urb); + if (urb->transfer_buffer != NULL) + usb_buffer_free(gspca_dev->dev, + urb->transfer_buffer_length, + urb->transfer_buffer, + urb->transfer_dma); + usb_free_urb(urb); + } +} + +/* + * search an input isochronous endpoint in an alternate setting + */ +static struct usb_host_endpoint *alt_isoc(struct usb_host_interface *alt, + __u8 epaddr) +{ + struct usb_host_endpoint *ep; + int i, attr; + + epaddr |= USB_DIR_IN; + for (i = 0; i < alt->desc.bNumEndpoints; i++) { + ep = &alt->endpoint[i]; + if (ep->desc.bEndpointAddress == epaddr) { + attr = ep->desc.bmAttributes + & USB_ENDPOINT_XFERTYPE_MASK; + if (attr == USB_ENDPOINT_XFER_ISOC) + return ep; + break; + } + } + return NULL; +} + +/* + * search an input isochronous endpoint + * + * The endpoint is defined by the subdriver. + * Use only the first isoc (some Zoran - 0x0572:0x0001 - have two such ep). + * This routine may be called many times when the bandwidth is too small + * (the bandwidth is checked on urb submit). + */ +struct usb_host_endpoint *get_isoc_ep(struct gspca_dev *gspca_dev) +{ + struct usb_interface *intf; + struct usb_host_endpoint *ep; + int i, ret; + + intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface); + ep = NULL; + i = gspca_dev->alt; /* previous alt setting */ + while (--i > 0) { /* alt 0 is unusable */ + ep = alt_isoc(&intf->altsetting[i], gspca_dev->cam.epaddr); + if (ep) + break; + } + if (ep == NULL) { + err("no ISOC endpoint found"); + return NULL; + } + PDEBUG(D_STREAM, "use ISOC alt %d ep 0x%02x", + i, ep->desc.bEndpointAddress); + ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, i); + if (ret < 0) { + err("set interface err %d", ret); + return NULL; + } + gspca_dev->alt = i; /* memorize the current alt setting */ + return ep; +} + +/* + * create the isochronous URBs + */ +static int create_urbs(struct gspca_dev *gspca_dev, + struct usb_host_endpoint *ep) +{ + struct urb *urb; + int n, nurbs, i, psize, npkt, bsize; + + /* calculate the packet size and the number of packets */ + psize = le16_to_cpu(ep->desc.wMaxPacketSize); + + /* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */ + psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3)); + npkt = ISO_MAX_SIZE / psize; + if (npkt > ISO_MAX_PKT) + npkt = ISO_MAX_PKT; + bsize = psize * npkt; + PDEBUG(D_STREAM, + "isoc %d pkts size %d (bsize:%d)", npkt, psize, bsize); + nurbs = DEF_NURBS; + gspca_dev->nurbs = nurbs; + for (n = 0; n < nurbs; n++) { + urb = usb_alloc_urb(npkt, GFP_KERNEL); + if (!urb) { + err("usb_alloc_urb failed"); + return -ENOMEM; + } + urb->transfer_buffer = usb_buffer_alloc(gspca_dev->dev, + bsize, + GFP_KERNEL, + &urb->transfer_dma); + + if (urb->transfer_buffer == NULL) { + usb_free_urb(urb); + destroy_urbs(gspca_dev); + err("usb_buffer_urb failed"); + return -ENOMEM; + } + gspca_dev->urb[n] = urb; + urb->dev = gspca_dev->dev; + urb->context = gspca_dev; + urb->pipe = usb_rcvisocpipe(gspca_dev->dev, + ep->desc.bEndpointAddress); + urb->transfer_flags = URB_ISO_ASAP + | URB_NO_TRANSFER_DMA_MAP; + urb->interval = ep->desc.bInterval; + urb->complete = isoc_irq; + urb->number_of_packets = npkt; + urb->transfer_buffer_length = bsize; + for (i = 0; i < npkt; i++) { + urb->iso_frame_desc[i].length = psize; + urb->iso_frame_desc[i].offset = psize * i; + } + } + return 0; +} + +/* + * start the USB transfer + */ +static int gspca_init_transfer(struct gspca_dev *gspca_dev) +{ + struct usb_host_endpoint *ep; + int n, ret; + + if (mutex_lock_interruptible(&gspca_dev->usb_lock)) + return -ERESTARTSYS; + + /* set the higher alternate setting and + * loop until urb submit succeeds */ + gspca_dev->alt = gspca_dev->nbalt; + for (;;) { + PDEBUG(D_STREAM, "init transfer alt %d", gspca_dev->alt); + ep = get_isoc_ep(gspca_dev); + if (ep == NULL) { + ret = -EIO; + goto out; + } + ret = create_urbs(gspca_dev, ep); + if (ret < 0) + goto out; + + /* start the cam */ + gspca_dev->sd_desc->start(gspca_dev); + gspca_dev->streaming = 1; + atomic_set(&gspca_dev->nevent, 0); + + /* submit the URBs */ + for (n = 0; n < gspca_dev->nurbs; n++) { + ret = usb_submit_urb(gspca_dev->urb[n], GFP_KERNEL); + if (ret < 0) { + PDEBUG(D_ERR|D_STREAM, + "usb_submit_urb [%d] err %d", n, ret); + gspca_dev->streaming = 0; + destroy_urbs(gspca_dev); + if (ret == -ENOSPC) + break; /* try the previous alt */ + goto out; + } + } + if (ret >= 0) + break; + } +out: + mutex_unlock(&gspca_dev->usb_lock); + return ret; +} + +static int gspca_set_alt0(struct gspca_dev *gspca_dev) +{ + int ret; + + ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, 0); + if (ret < 0) + PDEBUG(D_ERR|D_STREAM, "set interface 0 err %d", ret); + return ret; +} + +/* Note both the queue and the usb lock should be hold when calling this */ +static void gspca_stream_off(struct gspca_dev *gspca_dev) +{ + gspca_dev->streaming = 0; + atomic_set(&gspca_dev->nevent, 0); + if (gspca_dev->present) { + gspca_dev->sd_desc->stopN(gspca_dev); + destroy_urbs(gspca_dev); + gspca_set_alt0(gspca_dev); + gspca_dev->sd_desc->stop0(gspca_dev); + PDEBUG(D_STREAM, "stream off OK"); + } +} + +static void gspca_set_default_mode(struct gspca_dev *gspca_dev) +{ + int i; + + i = gspca_dev->cam.nmodes - 1; /* take the highest mode */ + gspca_dev->curr_mode = i; + gspca_dev->width = gspca_dev->cam.cam_mode[i].width; + gspca_dev->height = gspca_dev->cam.cam_mode[i].height; + gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i].pixelformat; +} + +static int wxh_to_mode(struct gspca_dev *gspca_dev, + int width, int height) +{ + int i; + + for (i = gspca_dev->cam.nmodes; --i > 0; ) { + if (width >= gspca_dev->cam.cam_mode[i].width + && height >= gspca_dev->cam.cam_mode[i].height) + break; + } + return i; +} + +/* + * search a mode with the right pixel format + */ +static int gspca_get_mode(struct gspca_dev *gspca_dev, + int mode, + int pixfmt) +{ + int modeU, modeD; + + modeU = modeD = mode; + while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) { + if (--modeD >= 0) { + if (gspca_dev->cam.cam_mode[modeD].pixelformat + == pixfmt) + return modeD; + } + if (++modeU < gspca_dev->cam.nmodes) { + if (gspca_dev->cam.cam_mode[modeU].pixelformat + == pixfmt) + return modeU; + } + } + return -EINVAL; +} + +static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv, + struct v4l2_fmtdesc *fmtdesc) +{ + struct gspca_dev *gspca_dev = priv; + int i, j, index; + __u32 fmt_tb[8]; + + /* give an index to each format */ + index = 0; + j = 0; + for (i = gspca_dev->cam.nmodes; --i >= 0; ) { + fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat; + j = 0; + for (;;) { + if (fmt_tb[j] == fmt_tb[index]) + break; + j++; + } + if (j == index) { + if (fmtdesc->index == index) + break; /* new format */ + index++; + if (index >= sizeof fmt_tb / sizeof fmt_tb[0]) + return -EINVAL; + } + } + if (i < 0) + return -EINVAL; /* no more format */ + + fmtdesc->pixelformat = fmt_tb[index]; + if (gspca_is_compressed(fmt_tb[index])) + fmtdesc->flags = V4L2_FMT_FLAG_COMPRESSED; + fmtdesc->type = V4L2_BUF_TYPE_VIDEO_CAPTURE; + fmtdesc->description[0] = fmtdesc->pixelformat & 0xff; + fmtdesc->description[1] = (fmtdesc->pixelformat >> 8) & 0xff; + fmtdesc->description[2] = (fmtdesc->pixelformat >> 16) & 0xff; + fmtdesc->description[3] = fmtdesc->pixelformat >> 24; + fmtdesc->description[4] = '\0'; + return 0; +} + +static int vidioc_g_fmt_vid_cap(struct file *file, void *priv, + struct v4l2_format *fmt) +{ + struct gspca_dev *gspca_dev = priv; + int mode; + + if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) + return -EINVAL; + mode = gspca_dev->curr_mode; + memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode], + sizeof fmt->fmt.pix); + return 0; +} + +static int try_fmt_vid_cap(struct gspca_dev *gspca_dev, + struct v4l2_format *fmt) +{ + int w, h, mode, mode2; + + if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) + return -EINVAL; + w = fmt->fmt.pix.width; + h = fmt->fmt.pix.height; + +#ifdef CONFIG_VIDEO_ADV_DEBUG + if (gspca_debug & D_CONF) + PDEBUG_MODE("try fmt cap", fmt->fmt.pix.pixelformat, w, h); +#endif + /* search the closest mode for width and height */ + mode = wxh_to_mode(gspca_dev, w, h); + + /* OK if right palette */ + if (gspca_dev->cam.cam_mode[mode].pixelformat + != fmt->fmt.pix.pixelformat) { + + /* else, search the closest mode with the same pixel format */ + mode2 = gspca_get_mode(gspca_dev, mode, + fmt->fmt.pix.pixelformat); + if (mode2 >= 0) + mode = mode2; +/* else + ; * no chance, return this mode */ + } + memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode], + sizeof fmt->fmt.pix); + return mode; /* used when s_fmt */ +} + +static int vidioc_try_fmt_vid_cap(struct file *file, + void *priv, + struct v4l2_format *fmt) +{ + struct gspca_dev *gspca_dev = priv; + int ret; + + ret = try_fmt_vid_cap(gspca_dev, fmt); + if (ret < 0) + return ret; + return 0; +} + +static int vidioc_s_fmt_vid_cap(struct file *file, void *priv, + struct v4l2_format *fmt) +{ + struct gspca_dev *gspca_dev = priv; + int ret; + + if (mutex_lock_interruptible(&gspca_dev->queue_lock)) + return -ERESTARTSYS; + + ret = try_fmt_vid_cap(gspca_dev, fmt); + if (ret < 0) + goto out; + + if (gspca_dev->nframes != 0 + && fmt->fmt.pix.sizeimage > gspca_dev->frsz) { + ret = -EINVAL; + goto out; + } + + if (ret == gspca_dev->curr_mode) { + ret = 0; + goto out; /* same mode */ + } + + if (gspca_dev->streaming) { + ret = -EBUSY; + goto out; + } + gspca_dev->width = fmt->fmt.pix.width; + gspca_dev->height = fmt->fmt.pix.height; + gspca_dev->pixfmt = fmt->fmt.pix.pixelformat; + gspca_dev->curr_mode = ret; + + ret = 0; +out: + mutex_unlock(&gspca_dev->queue_lock); + return ret; +} + +static int dev_open(struct inode *inode, struct file *file) +{ + struct gspca_dev *gspca_dev; + int ret; + + PDEBUG(D_STREAM, "%s open", current->comm); + gspca_dev = (struct gspca_dev *) video_devdata(file); + if (mutex_lock_interruptible(&gspca_dev->queue_lock)) + return -ERESTARTSYS; + if (!gspca_dev->present) { + ret = -ENODEV; + goto out; + } + + /* if not done yet, initialize the sensor */ + if (gspca_dev->users == 0) { + if (mutex_lock_interruptible(&gspca_dev->usb_lock)) { + ret = -ERESTARTSYS; + goto out; + } + ret = gspca_dev->sd_desc->open(gspca_dev); + mutex_unlock(&gspca_dev->usb_lock); + if (ret != 0) { + PDEBUG(D_ERR|D_CONF, "init device failed %d", ret); + goto out; + } + } else if (gspca_dev->users > 4) { /* (arbitrary value) */ + ret = -EBUSY; + goto out; + } + gspca_dev->users++; + file->private_data = gspca_dev; +#ifdef CONFIG_VIDEO_ADV_DEBUG + /* activate the v4l2 debug */ + if (gspca_debug & D_V4L2) + gspca_dev->vdev.debug |= 3; + else + gspca_dev->vdev.debug &= ~3; +#endif +out: + mutex_unlock(&gspca_dev->queue_lock); + if (ret != 0) + PDEBUG(D_ERR|D_STREAM, "open failed err %d", ret); + else + PDEBUG(D_STREAM, "open done"); + return ret; +} + +static int dev_close(struct inode *inode, struct file *file) +{ + struct gspca_dev *gspca_dev = file->private_data; + + PDEBUG(D_STREAM, "%s close", current->comm); + if (mutex_lock_interruptible(&gspca_dev->queue_lock)) + return -ERESTARTSYS; + gspca_dev->users--; + + /* if the file did the capture, free the streaming resources */ + if (gspca_dev->capt_file == file) { + mutex_lock(&gspca_dev->usb_lock); + if (gspca_dev->streaming) + gspca_stream_off(gspca_dev); + gspca_dev->sd_desc->close(gspca_dev); + mutex_unlock(&gspca_dev->usb_lock); + frame_free(gspca_dev); + gspca_dev->capt_file = NULL; + gspca_dev->memory = GSPCA_MEMORY_NO; + } + file->private_data = NULL; + mutex_unlock(&gspca_dev->queue_lock); + PDEBUG(D_STREAM, "close done"); + return 0; +} + +static int vidioc_querycap(struct file *file, void *priv, + struct v4l2_capability *cap) +{ + struct gspca_dev *gspca_dev = priv; + + memset(cap, 0, sizeof *cap); + strncpy(cap->driver, gspca_dev->sd_desc->name, sizeof cap->driver); + strncpy(cap->card, gspca_dev->cam.dev_name, sizeof cap->card); + strncpy(cap->bus_info, gspca_dev->dev->bus->bus_name, + sizeof cap->bus_info); + cap->version = DRIVER_VERSION_NUMBER; + cap->capabilities = V4L2_CAP_VIDEO_CAPTURE + | V4L2_CAP_STREAMING + | V4L2_CAP_READWRITE; + return 0; +} + +/* the use of V4L2_CTRL_FLAG_NEXT_CTRL asks for the controls to be sorted */ +static int vidioc_queryctrl(struct file *file, void *priv, + struct v4l2_queryctrl *q_ctrl) +{ + struct gspca_dev *gspca_dev = priv; + int i; + u32 id; + + id = q_ctrl->id; + if (id & V4L2_CTRL_FLAG_NEXT_CTRL) { + id &= V4L2_CTRL_ID_MASK; + id++; + for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) { + if (id >= gspca_dev->sd_desc->ctrls[i].qctrl.id) { + memcpy(q_ctrl, + &gspca_dev->sd_desc->ctrls[i].qctrl, + sizeof *q_ctrl); + return 0; + } + } + return -EINVAL; + } + for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) { + if (id == gspca_dev->sd_desc->ctrls[i].qctrl.id) { + memcpy(q_ctrl, + &gspca_dev->sd_desc->ctrls[i].qctrl, + sizeof *q_ctrl); + return 0; + } + } + if (id >= V4L2_CID_BASE + && id <= V4L2_CID_LASTP1) { + q_ctrl->flags |= V4L2_CTRL_FLAG_DISABLED; + return 0; + } + return -EINVAL; +} + +static int vidioc_s_ctrl(struct file *file, void *priv, + struct v4l2_control *ctrl) +{ + struct gspca_dev *gspca_dev = priv; + const struct ctrl *ctrls; + int i, ret; + + for (i = 0, ctrls = gspca_dev->sd_desc->ctrls; + i < gspca_dev->sd_desc->nctrls; + i++, ctrls++) { + if (ctrl->id != ctrls->qctrl.id) + continue; + if (ctrl->value < ctrls->qctrl.minimum + && ctrl->value > ctrls->qctrl.maximum) + return -ERANGE; + PDEBUG(D_CONF, "set ctrl [%08x] = %d", ctrl->id, ctrl->value); + if (mutex_lock_interruptible(&gspca_dev->usb_lock)) + return -ERESTARTSYS; + ret = ctrls->set(gspca_dev, ctrl->value); + mutex_unlock(&gspca_dev->usb_lock); + return ret; + } + return -EINVAL; +} + +static int vidioc_g_ctrl(struct file *file, void *priv, + struct v4l2_control *ctrl) +{ + struct gspca_dev *gspca_dev = priv; + + const struct ctrl *ctrls; + int i, ret; + + for (i = 0, ctrls = gspca_dev->sd_desc->ctrls; + i < gspca_dev->sd_desc->nctrls; + i++, ctrls++) { + if (ctrl->id != ctrls->qctrl.id) + continue; + if (mutex_lock_interruptible(&gspca_dev->usb_lock)) + return -ERESTARTSYS; + ret = ctrls->get(gspca_dev, &ctrl->value); + mutex_unlock(&gspca_dev->usb_lock); + return ret; + } + return -EINVAL; +} + +static int vidioc_querymenu(struct file *file, void *priv, + struct v4l2_querymenu *qmenu) +{ + struct gspca_dev *gspca_dev = priv; + + if (!gspca_dev->sd_desc->querymenu) + return -EINVAL; + return gspca_dev->sd_desc->querymenu(gspca_dev, qmenu); +} + +static int vidioc_enum_input(struct file *file, void *priv, + struct v4l2_input *input) +{ + struct gspca_dev *gspca_dev = priv; + + if (input->index != 0) + return -EINVAL; + memset(input, 0, sizeof *input); + input->type = V4L2_INPUT_TYPE_CAMERA; + strncpy(input->name, gspca_dev->sd_desc->name, + sizeof input->name); + return 0; +} + +static int vidioc_g_input(struct file *file, void *priv, unsigned int *i) +{ + *i = 0; + return 0; +} + +static int vidioc_s_input(struct file *file, void *priv, unsigned int i) +{ + if (i > 0) + return -EINVAL; + return (0); +} + +static int vidioc_reqbufs(struct file *file, void *priv, + struct v4l2_requestbuffers *rb) +{ + struct gspca_dev *gspca_dev = priv; + int i, ret = 0; + + if (rb->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) + return -EINVAL; + switch (rb->memory) { + case GSPCA_MEMORY_READ: /* (internal call) */ + case V4L2_MEMORY_MMAP: + case V4L2_MEMORY_USERPTR: + break; + default: + return -EINVAL; + } + if (mutex_lock_interruptible(&gspca_dev->queue_lock)) + return -ERESTARTSYS; + + if (gspca_dev->memory != GSPCA_MEMORY_NO + && gspca_dev->memory != rb->memory) { + ret = -EBUSY; + goto out; + } + + /* only one file may do the capture */ + if (gspca_dev->capt_file != NULL + && gspca_dev->capt_file != file) { + ret = -EBUSY; + goto out; + } + + /* if allocated, the buffers must not be mapped */ + for (i = 0; i < gspca_dev->nframes; i++) { + if (gspca_dev->frame[i].vma_use_count) { + ret = -EBUSY; + goto out; + } + } + + /* stop streaming */ + if (gspca_dev->streaming) { + mutex_lock(&gspca_dev->usb_lock); + gspca_stream_off(gspca_dev); + mutex_unlock(&gspca_dev->usb_lock); + } + + /* free the previous allocated buffers, if any */ + if (gspca_dev->nframes != 0) { + frame_free(gspca_dev); + gspca_dev->capt_file = NULL; + } + if (rb->count == 0) /* unrequest */ + goto out; + gspca_dev->memory = rb->memory; + ret = frame_alloc(gspca_dev, rb->count); + if (ret == 0) { + rb->count = gspca_dev->nframes; + gspca_dev->capt_file = file; + } +out: + mutex_unlock(&gspca_dev->queue_lock); + PDEBUG(D_STREAM, "reqbufs st:%d c:%d", ret, rb->count); + return ret; +} + +static int vidioc_querybuf(struct file *file, void *priv, + struct v4l2_buffer *v4l2_buf) +{ + struct gspca_dev *gspca_dev = priv; + struct gspca_frame *frame; + + if (v4l2_buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE + || v4l2_buf->index < 0 + || v4l2_buf->index >= gspca_dev->nframes) + return -EINVAL; + + frame = &gspca_dev->frame[v4l2_buf->index]; + memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf); + return 0; +} + +static int vidioc_streamon(struct file *file, void *priv, + enum v4l2_buf_type buf_type) +{ + struct gspca_dev *gspca_dev = priv; + int ret; + + if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE) + return -EINVAL; + if (mutex_lock_interruptible(&gspca_dev->queue_lock)) + return -ERESTARTSYS; + if (!gspca_dev->present) { + ret = -ENODEV; + goto out; + } + if (gspca_dev->nframes == 0) { + ret = -EINVAL; + goto out; + } + if (!gspca_dev->streaming) { + ret = gspca_init_transfer(gspca_dev); + if (ret < 0) + goto out; + } +#ifdef CONFIG_VIDEO_ADV_DEBUG + if (gspca_debug & D_STREAM) { + PDEBUG_MODE("stream on OK", + gspca_dev->pixfmt, + gspca_dev->width, + gspca_dev->height); + } +#endif + ret = 0; +out: + mutex_unlock(&gspca_dev->queue_lock); + return ret; +} + +static int vidioc_streamoff(struct file *file, void *priv, + enum v4l2_buf_type buf_type) +{ + struct gspca_dev *gspca_dev = priv; + int i, ret; + + if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE) + return -EINVAL; + if (!gspca_dev->streaming) + return 0; + if (mutex_lock_interruptible(&gspca_dev->queue_lock)) + return -ERESTARTSYS; + + /* stop streaming */ + if (mutex_lock_interruptible(&gspca_dev->usb_lock)) { + ret = -ERESTARTSYS; + goto out; + } + gspca_stream_off(gspca_dev); + mutex_unlock(&gspca_dev->usb_lock); + + /* empty the application queues */ + for (i = 0; i < gspca_dev->nframes; i++) + gspca_dev->frame[i].v4l2_buf.flags &= ~BUF_ALL_FLAGS; + gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0; + gspca_dev->last_packet_type = DISCARD_PACKET; + gspca_dev->sequence = 0; + atomic_set(&gspca_dev->nevent, 0); + ret = 0; +out: + mutex_unlock(&gspca_dev->queue_lock); + return ret; +} + +static int vidioc_g_jpegcomp(struct file *file, void *priv, + struct v4l2_jpegcompression *jpegcomp) +{ + struct gspca_dev *gspca_dev = priv; + int ret; + + if (!gspca_dev->sd_desc->get_jcomp) + return -EINVAL; + if (mutex_lock_interruptible(&gspca_dev->usb_lock)) + return -ERESTARTSYS; + ret = gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp); + mutex_unlock(&gspca_dev->usb_lock); + return ret; +} + +static int vidioc_s_jpegcomp(struct file *file, void *priv, + struct v4l2_jpegcompression *jpegcomp) +{ + struct gspca_dev *gspca_dev = priv; + int ret; + + if (mutex_lock_interruptible(&gspca_dev->usb_lock)) + return -ERESTARTSYS; + if (!gspca_dev->sd_desc->set_jcomp) + return -EINVAL; + ret = gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp); + mutex_unlock(&gspca_dev->usb_lock); + return ret; +} + +static int vidioc_g_parm(struct file *filp, void *priv, + struct v4l2_streamparm *parm) +{ + struct gspca_dev *gspca_dev = priv; + + memset(parm, 0, sizeof *parm); + parm->type = V4L2_BUF_TYPE_VIDEO_CAPTURE; + parm->parm.capture.readbuffers = gspca_dev->nbufread; + return 0; +} + +static int vidioc_s_parm(struct file *filp, void *priv, + struct v4l2_streamparm *parm) +{ + struct gspca_dev *gspca_dev = priv; + int n; + + n = parm->parm.capture.readbuffers; + if (n == 0 || n > GSPCA_MAX_FRAMES) + parm->parm.capture.readbuffers = gspca_dev->nbufread; + else + gspca_dev->nbufread = n; + return 0; +} + +static int vidioc_s_std(struct file *filp, void *priv, + v4l2_std_id *parm) +{ + return 0; +} + +#ifdef CONFIG_VIDEO_V4L1_COMPAT +static int vidiocgmbuf(struct file *file, void *priv, + struct video_mbuf *mbuf) +{ + struct gspca_dev *gspca_dev = file->private_data; + int i; + + PDEBUG(D_STREAM, "cgmbuf"); + if (gspca_dev->nframes == 0) { + int ret; + + { + struct v4l2_format fmt; + + memset(&fmt, 0, sizeof fmt); + fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; + i = gspca_dev->cam.nmodes - 1; /* highest mode */ + fmt.fmt.pix.width = gspca_dev->cam.cam_mode[i].width; + fmt.fmt.pix.height = gspca_dev->cam.cam_mode[i].height; + fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_BGR24; + ret = vidioc_s_fmt_vid_cap(file, priv, &fmt); + if (ret != 0) + return ret; + } + { + struct v4l2_requestbuffers rb; + + memset(&rb, 0, sizeof rb); + rb.count = 4; + rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; + rb.memory = V4L2_MEMORY_MMAP; + ret = vidioc_reqbufs(file, priv, &rb); + if (ret != 0) + return ret; + } + } + mbuf->frames = gspca_dev->nframes; + mbuf->size = gspca_dev->frsz * gspca_dev->nframes; + for (i = 0; i < mbuf->frames; i++) + mbuf->offsets[i] = gspca_dev->frame[i].v4l2_buf.m.offset; + return 0; +} +#endif + +static int dev_mmap(struct file *file, struct vm_area_struct *vma) +{ + struct gspca_dev *gspca_dev = file->private_data; + struct gspca_frame *frame; + struct page *page; + unsigned long addr, start, size; + int i, ret; + + start = vma->vm_start; + size = vma->vm_end - vma->vm_start; + PDEBUG(D_STREAM, "mmap start:%08x size:%d", (int) start, (int) size); + + if (mutex_lock_interruptible(&gspca_dev->queue_lock)) + return -ERESTARTSYS; + if (!gspca_dev->present) { + ret = -ENODEV; + goto out; + } + if (gspca_dev->capt_file != file) { + ret = -EINVAL; + goto out; + } + + frame = NULL; + for (i = 0; i < gspca_dev->nframes; ++i) { + if (gspca_dev->frame[i].v4l2_buf.memory != V4L2_MEMORY_MMAP) { + PDEBUG(D_STREAM, "mmap bad memory type"); + break; + } + if ((gspca_dev->frame[i].v4l2_buf.m.offset >> PAGE_SHIFT) + == vma->vm_pgoff) { + frame = &gspca_dev->frame[i]; + break; + } + } + if (frame == NULL) { + PDEBUG(D_STREAM, "mmap no frame buffer found"); + ret = -EINVAL; + goto out; + } +#ifdef CONFIG_VIDEO_V4L1_COMPAT + /* v4l1 maps all the buffers */ + if (i != 0 + || size != frame->v4l2_buf.length * gspca_dev->nframes) +#endif + if (size != frame->v4l2_buf.length) { + PDEBUG(D_STREAM, "mmap bad size"); + ret = -EINVAL; + goto out; + } + + /* + * - VM_IO marks the area as being a mmaped region for I/O to a + * device. It also prevents the region from being core dumped. + */ + vma->vm_flags |= VM_IO; + + addr = (unsigned long) frame->data; + while (size > 0) { + page = vmalloc_to_page((void *) addr); + ret = vm_insert_page(vma, start, page); + if (ret < 0) + goto out; + start += PAGE_SIZE; + addr += PAGE_SIZE; + size -= PAGE_SIZE; + } + + vma->vm_ops = &gspca_vm_ops; + vma->vm_private_data = frame; + gspca_vm_open(vma); + ret = 0; +out: + mutex_unlock(&gspca_dev->queue_lock); + return ret; +} + +/* + * wait for a video frame + * + * If a frame is ready, its index is returned. + */ +static int frame_wait(struct gspca_dev *gspca_dev, + int nonblock_ing) +{ + struct gspca_frame *frame; + int i, j, ret; + + /* check if a frame is ready */ + i = gspca_dev->fr_o; + j = gspca_dev->fr_queue[i]; + frame = &gspca_dev->frame[j]; + if (frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE) { + atomic_dec(&gspca_dev->nevent); + goto ok; + } + if (nonblock_ing) /* no frame yet */ + return -EAGAIN; + + /* wait till a frame is ready */ + for (;;) { + ret = wait_event_interruptible_timeout(gspca_dev->wq, + atomic_read(&gspca_dev->nevent) > 0, + msecs_to_jiffies(3000)); + if (ret <= 0) { + if (ret < 0) + return ret; /* interrupt */ + return -EIO; /* timeout */ + } + atomic_dec(&gspca_dev->nevent); + if (!gspca_dev->streaming || !gspca_dev->present) + return -EIO; + i = gspca_dev->fr_o; + j = gspca_dev->fr_queue[i]; + frame = &gspca_dev->frame[j]; + if (frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE) + break; + } +ok: + gspca_dev->fr_o = (i + 1) % gspca_dev->nframes; + PDEBUG(D_FRAM, "frame wait q:%d i:%d o:%d", + gspca_dev->fr_q, + gspca_dev->fr_i, + gspca_dev->fr_o); + + if (gspca_dev->sd_desc->dq_callback) { + mutex_lock(&gspca_dev->usb_lock); + gspca_dev->sd_desc->dq_callback(gspca_dev); + mutex_unlock(&gspca_dev->usb_lock); + } + return j; +} + +/* + * dequeue a video buffer + * + * If nonblock_ing is false, block until a buffer is available. + */ +static int vidioc_dqbuf(struct file *file, void *priv, + struct v4l2_buffer *v4l2_buf) +{ + struct gspca_dev *gspca_dev = priv; + struct gspca_frame *frame; + int i, ret; + + PDEBUG(D_FRAM, "dqbuf"); + if (v4l2_buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) + return -EINVAL; + if (v4l2_buf->memory != gspca_dev->memory) + return -EINVAL; + + /* if not streaming, be sure the application will not loop forever */ + if (!(file->f_flags & O_NONBLOCK) + && !gspca_dev->streaming && gspca_dev->users == 1) + return -EINVAL; + + /* only the capturing file may dequeue */ + if (gspca_dev->capt_file != file) + return -EINVAL; + + /* only one dequeue / read at a time */ + if (mutex_lock_interruptible(&gspca_dev->read_lock)) + return -ERESTARTSYS; + + ret = frame_wait(gspca_dev, file->f_flags & O_NONBLOCK); + if (ret < 0) + goto out; + i = ret; /* frame index */ + frame = &gspca_dev->frame[i]; + if (gspca_dev->memory == V4L2_MEMORY_USERPTR) { + if (copy_to_user((__u8 *) frame->v4l2_buf.m.userptr, + frame->data, + frame->v4l2_buf.bytesused)) { + PDEBUG(D_ERR|D_STREAM, + "dqbuf cp to user failed"); + ret = -EFAULT; + goto out; + } + } + frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE; + memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf); + PDEBUG(D_FRAM, "dqbuf %d", i); + ret = 0; +out: + mutex_unlock(&gspca_dev->read_lock); + return ret; +} + +/* + * queue a video buffer + * + * Attempting to queue a buffer that has already been + * queued will return -EINVAL. + */ +static int vidioc_qbuf(struct file *file, void *priv, + struct v4l2_buffer *v4l2_buf) +{ + struct gspca_dev *gspca_dev = priv; + struct gspca_frame *frame; + int i, index, ret; + + PDEBUG(D_FRAM, "qbuf %d", v4l2_buf->index); + if (v4l2_buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) + return -EINVAL; + + if (mutex_lock_interruptible(&gspca_dev->queue_lock)) + return -ERESTARTSYS; + + index = v4l2_buf->index; + if ((unsigned) index >= gspca_dev->nframes) { + PDEBUG(D_FRAM, + "qbuf idx %d >= %d", index, gspca_dev->nframes); + ret = -EINVAL; + goto out; + } + if (v4l2_buf->memory != gspca_dev->memory) { + PDEBUG(D_FRAM, "qbuf bad memory type"); + ret = -EINVAL; + goto out; + } + + frame = &gspca_dev->frame[index]; + if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) { + PDEBUG(D_FRAM, "qbuf bad state"); + ret = -EINVAL; + goto out; + } + + frame->v4l2_buf.flags |= V4L2_BUF_FLAG_QUEUED; +/* frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE; */ + + if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) { + frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr; + frame->v4l2_buf.length = v4l2_buf->length; + } + + /* put the buffer in the 'queued' queue */ + i = gspca_dev->fr_q; + gspca_dev->fr_queue[i] = index; + gspca_dev->fr_q = (i + 1) % gspca_dev->nframes; + PDEBUG(D_FRAM, "qbuf q:%d i:%d o:%d", + gspca_dev->fr_q, + gspca_dev->fr_i, + gspca_dev->fr_o); + + v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED; + v4l2_buf->flags &= ~V4L2_BUF_FLAG_DONE; + ret = 0; +out: + mutex_unlock(&gspca_dev->queue_lock); + return ret; +} + +/* + * allocate the resources for read() + */ +static int read_alloc(struct gspca_dev *gspca_dev, + struct file *file) +{ + struct v4l2_buffer v4l2_buf; + int i, ret; + + PDEBUG(D_STREAM, "read alloc"); + if (gspca_dev->nframes == 0) { + struct v4l2_requestbuffers rb; + + memset(&rb, 0, sizeof rb); + rb.count = gspca_dev->nbufread; + rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; + rb.memory = GSPCA_MEMORY_READ; + ret = vidioc_reqbufs(file, gspca_dev, &rb); + if (ret != 0) { + PDEBUG(D_STREAM, "read reqbuf err %d", ret); + return ret; + } + memset(&v4l2_buf, 0, sizeof v4l2_buf); + v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; + v4l2_buf.memory = GSPCA_MEMORY_READ; + for (i = 0; i < gspca_dev->nbufread; i++) { + v4l2_buf.index = i; + ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf); + if (ret != 0) { + PDEBUG(D_STREAM, "read qbuf err: %d", ret); + return ret; + } + } + gspca_dev->memory = GSPCA_MEMORY_READ; + } + + /* start streaming */ + ret = vidioc_streamon(file, gspca_dev, V4L2_BUF_TYPE_VIDEO_CAPTURE); + if (ret != 0) + PDEBUG(D_STREAM, "read streamon err %d", ret); + return ret; +} + +static unsigned int dev_poll(struct file *file, poll_table *wait) +{ + struct gspca_dev *gspca_dev = file->private_data; + int i, ret; + + PDEBUG(D_FRAM, "poll"); + + poll_wait(file, &gspca_dev->wq, wait); + if (!gspca_dev->present) + return POLLERR; + + /* if reqbufs is not done, the user would use read() */ + if (gspca_dev->nframes == 0) { + if (gspca_dev->memory != GSPCA_MEMORY_NO) + return POLLERR; /* not the 1st time */ + ret = read_alloc(gspca_dev, file); + if (ret != 0) + return POLLERR; + } + + if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0) + return POLLERR; + if (!gspca_dev->present) { + ret = POLLERR; + goto out; + } + + /* check the next incoming buffer */ + i = gspca_dev->fr_o; + i = gspca_dev->fr_queue[i]; + if (gspca_dev->frame[i].v4l2_buf.flags & V4L2_BUF_FLAG_DONE) + ret = POLLIN | POLLRDNORM; /* something to read */ + else + ret = 0; +out: + mutex_unlock(&gspca_dev->queue_lock); + return ret; +} + +static ssize_t dev_read(struct file *file, char __user *data, + size_t count, loff_t *ppos) +{ + struct gspca_dev *gspca_dev = file->private_data; + struct gspca_frame *frame; + struct v4l2_buffer v4l2_buf; + struct timeval timestamp; + int n, ret, ret2; + + PDEBUG(D_FRAM, "read (%zd)", count); + if (!gspca_dev->present) + return -ENODEV; + switch (gspca_dev->memory) { + case GSPCA_MEMORY_NO: /* first time */ + ret = read_alloc(gspca_dev, file); + if (ret != 0) + return ret; + break; + case GSPCA_MEMORY_READ: + if (gspca_dev->capt_file == file) + break; + /* fall thru */ + default: + return -EINVAL; + } + + /* get a frame */ + jiffies_to_timeval(get_jiffies_64(), ×tamp); + timestamp.tv_sec--; + n = 2; + for (;;) { + memset(&v4l2_buf, 0, sizeof v4l2_buf); + v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; + v4l2_buf.memory = GSPCA_MEMORY_READ; + ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf); + if (ret != 0) { + PDEBUG(D_STREAM, "read dqbuf err %d", ret); + return ret; + } + + /* if the process slept for more than 1 second, + * get anewer frame */ + frame = &gspca_dev->frame[v4l2_buf.index]; + if (--n < 0) + break; /* avoid infinite loop */ + if (frame->v4l2_buf.timestamp.tv_sec >= timestamp.tv_sec) + break; + ret = vidioc_qbuf(file, gspca_dev, &v4l2_buf); + if (ret != 0) { + PDEBUG(D_STREAM, "read qbuf err %d", ret); + return ret; + } + } + + /* copy the frame */ + if (count > frame->v4l2_buf.bytesused) + count = frame->v4l2_buf.bytesused; + ret = copy_to_user(data, frame->data, count); + if (ret != 0) { + PDEBUG(D_ERR|D_STREAM, + "read cp to user lack %d / %zd", ret, count); + ret = -EFAULT; + goto out; + } + ret = count; +out: + /* in each case, requeue the buffer */ + ret2 = vidioc_qbuf(file, gspca_dev, &v4l2_buf); + if (ret2 != 0) + return ret2; + return ret; +} + +static void dev_release(struct video_device *vfd) +{ + /* nothing */ +} + +static struct file_operations dev_fops = { + .owner = THIS_MODULE, + .open = dev_open, + .release = dev_close, + .read = dev_read, + .mmap = dev_mmap, + .ioctl = video_ioctl2, +#ifdef CONFIG_COMPAT + .compat_ioctl = v4l_compat_ioctl32, +#endif + .llseek = no_llseek, + .poll = dev_poll, +}; + +static struct video_device gspca_template = { + .name = "gspca main driver", + .type = VID_TYPE_CAPTURE, + .fops = &dev_fops, + .release = dev_release, /* mandatory */ + .minor = -1, + .vidioc_querycap = vidioc_querycap, + .vidioc_dqbuf = vidioc_dqbuf, + .vidioc_qbuf = vidioc_qbuf, + .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap, + .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap, + .vidioc_g_fmt_vid_cap = vidioc_g_fmt_vid_cap, + .vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap, + .vidioc_streamon = vidioc_streamon, + .vidioc_queryctrl = vidioc_queryctrl, + .vidioc_g_ctrl = vidioc_g_ctrl, + .vidioc_s_ctrl = vidioc_s_ctrl, + .vidioc_querymenu = vidioc_querymenu, + .vidioc_enum_input = vidioc_enum_input, + .vidioc_g_input = vidioc_g_input, + .vidioc_s_input = vidioc_s_input, + .vidioc_reqbufs = vidioc_reqbufs, + .vidioc_querybuf = vidioc_querybuf, + .vidioc_streamoff = vidioc_streamoff, + .vidioc_g_jpegcomp = vidioc_g_jpegcomp, + .vidioc_s_jpegcomp = vidioc_s_jpegcomp, + .vidioc_g_parm = vidioc_g_parm, + .vidioc_s_parm = vidioc_s_parm, + .vidioc_s_std = vidioc_s_std, +#ifdef CONFIG_VIDEO_V4L1_COMPAT + .vidiocgmbuf = vidiocgmbuf, +#endif +}; + +/* + * probe and create a new gspca device + * + * This function must be called by the sub-driver when it is + * called for probing a new device. + */ +int gspca_dev_probe(struct usb_interface *intf, + const struct usb_device_id *id, + const struct sd_desc *sd_desc, + int dev_size, + struct module *module) +{ + struct usb_interface_descriptor *interface; + struct gspca_dev *gspca_dev; + struct usb_device *dev = interface_to_usbdev(intf); + int ret; + + PDEBUG(D_PROBE, "probing %04x:%04x", id->idVendor, id->idProduct); + + /* we don't handle multi-config cameras */ + if (dev->descriptor.bNumConfigurations != 1) + return -ENODEV; + interface = &intf->cur_altsetting->desc; + if (interface->bInterfaceNumber > 0) + return -ENODEV; + + /* create the device */ + if (dev_size < sizeof *gspca_dev) + dev_size = sizeof *gspca_dev; + gspca_dev = kzalloc(dev_size, GFP_KERNEL); + if (gspca_dev == NULL) { + err("couldn't kzalloc gspca struct"); + return -EIO; + } + gspca_dev->dev = dev; + gspca_dev->iface = interface->bInterfaceNumber; + gspca_dev->nbalt = intf->num_altsetting; + gspca_dev->sd_desc = sd_desc; +/* gspca_dev->users = 0; (done by kzalloc) */ + gspca_dev->nbufread = 2; + + /* configure the subdriver */ + ret = gspca_dev->sd_desc->config(gspca_dev, id); + if (ret < 0) + goto out; + ret = gspca_set_alt0(gspca_dev); + if (ret < 0) + goto out; + gspca_set_default_mode(gspca_dev); + + mutex_init(&gspca_dev->usb_lock); + mutex_init(&gspca_dev->read_lock); + mutex_init(&gspca_dev->queue_lock); + init_waitqueue_head(&gspca_dev->wq); + + /* init video stuff */ + memcpy(&gspca_dev->vdev, &gspca_template, sizeof gspca_template); + gspca_dev->vdev.dev = &dev->dev; + memcpy(&gspca_dev->fops, &dev_fops, sizeof gspca_dev->fops); + gspca_dev->vdev.fops = &gspca_dev->fops; + gspca_dev->fops.owner = module; /* module protection */ + ret = video_register_device(&gspca_dev->vdev, + VFL_TYPE_GRABBER, + video_nr); + if (ret < 0) { + err("video_register_device err %d", ret); + goto out; + } + + gspca_dev->present = 1; + usb_set_intfdata(intf, gspca_dev); + PDEBUG(D_PROBE, "probe ok"); + return 0; +out: + kfree(gspca_dev); + return ret; +} +EXPORT_SYMBOL(gspca_dev_probe); + +/* + * USB disconnection + * + * This function must be called by the sub-driver + * when the device disconnects, after the specific resources are freed. + */ +void gspca_disconnect(struct usb_interface *intf) +{ + struct gspca_dev *gspca_dev = usb_get_intfdata(intf); + + if (!gspca_dev) + return; + gspca_dev->present = 0; + mutex_lock(&gspca_dev->queue_lock); + mutex_lock(&gspca_dev->usb_lock); + gspca_dev->streaming = 0; + destroy_urbs(gspca_dev); + mutex_unlock(&gspca_dev->usb_lock); + mutex_unlock(&gspca_dev->queue_lock); + while (gspca_dev->users != 0) { /* wait until fully closed */ + atomic_inc(&gspca_dev->nevent); + wake_up_interruptible(&gspca_dev->wq); /* wake processes */ + schedule(); + } +/* We don't want people trying to open up the device */ + video_unregister_device(&gspca_dev->vdev); +/* Free the memory */ + kfree(gspca_dev); + PDEBUG(D_PROBE, "disconnect complete"); +} +EXPORT_SYMBOL(gspca_disconnect); + +/* -- cam driver utility functions -- */ + +/* auto gain and exposure algorithm based on the knee algorithm described here: + http://ytse.tricolour.net/docs/LowLightOptimization.html + + Returns 0 if no changes were made, 1 if the gain and or exposure settings + where changed. */ +int gspca_auto_gain_n_exposure(struct gspca_dev *gspca_dev, int avg_lum, + int desired_avg_lum, int deadzone, int gain_knee, int exposure_knee) +{ + int i, steps, gain, orig_gain, exposure, orig_exposure, autogain; + const struct ctrl *gain_ctrl = NULL; + const struct ctrl *exposure_ctrl = NULL; + const struct ctrl *autogain_ctrl = NULL; + int retval = 0; + + for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) { + if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_GAIN) + gain_ctrl = &gspca_dev->sd_desc->ctrls[i]; + if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_EXPOSURE) + exposure_ctrl = &gspca_dev->sd_desc->ctrls[i]; + if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_AUTOGAIN) + autogain_ctrl = &gspca_dev->sd_desc->ctrls[i]; + } + if (!gain_ctrl || !exposure_ctrl || !autogain_ctrl) { + PDEBUG(D_ERR, "Error: gspca_auto_gain_n_exposure called " + "on cam without (auto)gain/exposure"); + return 0; + } + + if (gain_ctrl->get(gspca_dev, &gain) || + exposure_ctrl->get(gspca_dev, &exposure) || + autogain_ctrl->get(gspca_dev, &autogain) || !autogain) + return 0; + + orig_gain = gain; + orig_exposure = exposure; + + /* If we are of a multiple of deadzone, do multiple steps to reach the + desired lumination fast (with the risc of a slight overshoot) */ + steps = abs(desired_avg_lum - avg_lum) / deadzone; + + PDEBUG(D_FRAM, "autogain: lum: %d, desired: %d, steps: %d\n", + avg_lum, desired_avg_lum, steps); + + for (i = 0; i < steps; i++) { + if (avg_lum > desired_avg_lum) { + if (gain > gain_knee) + gain--; + else if (exposure > exposure_knee) + exposure--; + else if (gain > gain_ctrl->qctrl.default_value) + gain--; + else if (exposure > exposure_ctrl->qctrl.minimum) + exposure--; + else if (gain > gain_ctrl->qctrl.minimum) + gain--; + else + break; + } else { + if (gain < gain_ctrl->qctrl.default_value) + gain++; + else if (exposure < exposure_knee) + exposure++; + else if (gain < gain_knee) + gain++; + else if (exposure < exposure_ctrl->qctrl.maximum) + exposure++; + else if (gain < gain_ctrl->qctrl.maximum) + gain++; + else + break; + } + } + + if (gain != orig_gain) { + gain_ctrl->set(gspca_dev, gain); + retval = 1; + } + if (exposure != orig_exposure) { + exposure_ctrl->set(gspca_dev, exposure); + retval = 1; + } + + return retval; +} +EXPORT_SYMBOL(gspca_auto_gain_n_exposure); + +/* -- module insert / remove -- */ +static int __init gspca_init(void) +{ + info("main v%s registered", version); + return 0; +} +static void __exit gspca_exit(void) +{ + info("main deregistered"); +} + +module_init(gspca_init); +module_exit(gspca_exit); + +#ifdef CONFIG_VIDEO_ADV_DEBUG +module_param_named(debug, gspca_debug, int, 0644); +MODULE_PARM_DESC(debug, + "Debug (bit) 0x01:error 0x02:probe 0x04:config" + " 0x08:stream 0x10:frame 0x20:packet 0x40:USBin 0x80:USBout" + " 0x0100: v4l2"); +#endif |