diff options
Diffstat (limited to 'drivers/media/video/pwc/pwc-if.c')
| -rw-r--r-- | drivers/media/video/pwc/pwc-if.c | 2205 |
1 files changed, 2205 insertions, 0 deletions
diff --git a/drivers/media/video/pwc/pwc-if.c b/drivers/media/video/pwc/pwc-if.c new file mode 100644 index 000000000000..41418294a32b --- /dev/null +++ b/drivers/media/video/pwc/pwc-if.c @@ -0,0 +1,2205 @@ +/* Linux driver for Philips webcam + USB and Video4Linux interface part. + (C) 1999-2004 Nemosoft Unv. + (C) 2004 Luc Saillard (luc@saillard.org) + + NOTE: this version of pwc is an unofficial (modified) release of pwc & pcwx + driver and thus may have bugs that are not present in the original version. + Please send bug reports and support requests to <luc@saillard.org>. + The decompression routines have been implemented by reverse-engineering the + Nemosoft binary pwcx module. Caveat emptor. + + 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + +*/ + +/* + This code forms the interface between the USB layers and the Philips + specific stuff. Some adanved stuff of the driver falls under an + NDA, signed between me and Philips B.V., Eindhoven, the Netherlands, and + is thus not distributed in source form. The binary pwcx.o module + contains the code that falls under the NDA. + + In case you're wondering: 'pwc' stands for "Philips WebCam", but + I really didn't want to type 'philips_web_cam' every time (I'm lazy as + any Linux kernel hacker, but I don't like uncomprehensible abbreviations + without explanation). + + Oh yes, convention: to disctinguish between all the various pointers to + device-structures, I use these names for the pointer variables: + udev: struct usb_device * + vdev: struct video_device * + pdev: struct pwc_devive * +*/ + +/* Contributors: + - Alvarado: adding whitebalance code + - Alistar Moire: QuickCam 3000 Pro device/product ID + - Tony Hoyle: Creative Labs Webcam 5 device/product ID + - Mark Burazin: solving hang in VIDIOCSYNC when camera gets unplugged + - Jk Fang: Sotec Afina Eye ID + - Xavier Roche: QuickCam Pro 4000 ID + - Jens Knudsen: QuickCam Zoom ID + - J. Debert: QuickCam for Notebooks ID +*/ + +#include <linux/errno.h> +#include <linux/init.h> +#include <linux/mm.h> +#include <linux/module.h> +#include <linux/poll.h> +#include <linux/slab.h> +#include <linux/vmalloc.h> +#include <asm/io.h> + +#include "pwc.h" +#include "pwc-ioctl.h" +#include "pwc-kiara.h" +#include "pwc-timon.h" +#include "pwc-uncompress.h" + +/* Function prototypes and driver templates */ + +/* hotplug device table support */ +static struct usb_device_id pwc_device_table [] = { + { USB_DEVICE(0x0471, 0x0302) }, /* Philips models */ + { USB_DEVICE(0x0471, 0x0303) }, + { USB_DEVICE(0x0471, 0x0304) }, + { USB_DEVICE(0x0471, 0x0307) }, + { USB_DEVICE(0x0471, 0x0308) }, + { USB_DEVICE(0x0471, 0x030C) }, + { USB_DEVICE(0x0471, 0x0310) }, + { USB_DEVICE(0x0471, 0x0311) }, + { USB_DEVICE(0x0471, 0x0312) }, + { USB_DEVICE(0x0471, 0x0313) }, /* the 'new' 720K */ + { USB_DEVICE(0x069A, 0x0001) }, /* Askey */ + { USB_DEVICE(0x046D, 0x08B0) }, /* Logitech QuickCam Pro 3000 */ + { USB_DEVICE(0x046D, 0x08B1) }, /* Logitech QuickCam Notebook Pro */ + { USB_DEVICE(0x046D, 0x08B2) }, /* Logitech QuickCam Pro 4000 */ + { USB_DEVICE(0x046D, 0x08B3) }, /* Logitech QuickCam Zoom (old model) */ + { USB_DEVICE(0x046D, 0x08B4) }, /* Logitech QuickCam Zoom (new model) */ + { USB_DEVICE(0x046D, 0x08B5) }, /* Logitech QuickCam Orbit/Sphere */ + { USB_DEVICE(0x046D, 0x08B6) }, /* Logitech (reserved) */ + { USB_DEVICE(0x046D, 0x08B7) }, /* Logitech (reserved) */ + { USB_DEVICE(0x046D, 0x08B8) }, /* Logitech (reserved) */ + { USB_DEVICE(0x055D, 0x9000) }, /* Samsung */ + { USB_DEVICE(0x055D, 0x9001) }, + { USB_DEVICE(0x041E, 0x400C) }, /* Creative Webcam 5 */ + { USB_DEVICE(0x041E, 0x4011) }, /* Creative Webcam Pro Ex */ + { USB_DEVICE(0x04CC, 0x8116) }, /* Afina Eye */ + { USB_DEVICE(0x06BE, 0x8116) }, /* new Afina Eye */ + { USB_DEVICE(0x0d81, 0x1910) }, /* Visionite */ + { USB_DEVICE(0x0d81, 0x1900) }, + { } +}; +MODULE_DEVICE_TABLE(usb, pwc_device_table); + +static int usb_pwc_probe(struct usb_interface *intf, const struct usb_device_id *id); +static void usb_pwc_disconnect(struct usb_interface *intf); + +static struct usb_driver pwc_driver = { + .name = "Philips webcam", /* name */ + .id_table = pwc_device_table, + .probe = usb_pwc_probe, /* probe() */ + .disconnect = usb_pwc_disconnect, /* disconnect() */ +}; + +#define MAX_DEV_HINTS 20 +#define MAX_ISOC_ERRORS 20 + +static int default_size = PSZ_QCIF; +static int default_fps = 10; +static int default_fbufs = 3; /* Default number of frame buffers */ +static int default_mbufs = 2; /* Default number of mmap() buffers */ + int pwc_trace = TRACE_MODULE | TRACE_FLOW | TRACE_PWCX; +static int power_save = 0; +static int led_on = 100, led_off = 0; /* defaults to LED that is on while in use */ +static int pwc_preferred_compression = 2; /* 0..3 = uncompressed..high */ +static struct { + int type; + char serial_number[30]; + int device_node; + struct pwc_device *pdev; +} device_hint[MAX_DEV_HINTS]; + +/***/ + +static int pwc_video_open(struct inode *inode, struct file *file); +static int pwc_video_close(struct inode *inode, struct file *file); +static ssize_t pwc_video_read(struct file *file, char __user * buf, + size_t count, loff_t *ppos); +static unsigned int pwc_video_poll(struct file *file, poll_table *wait); +static int pwc_video_ioctl(struct inode *inode, struct file *file, + unsigned int ioctlnr, unsigned long arg); +static int pwc_video_mmap(struct file *file, struct vm_area_struct *vma); + +static struct file_operations pwc_fops = { + .owner = THIS_MODULE, + .open = pwc_video_open, + .release = pwc_video_close, + .read = pwc_video_read, + .poll = pwc_video_poll, + .mmap = pwc_video_mmap, + .ioctl = pwc_video_ioctl, + .compat_ioctl = v4l_compat_ioctl32, + .llseek = no_llseek, +}; +static struct video_device pwc_template = { + .owner = THIS_MODULE, + .name = "Philips Webcam", /* Filled in later */ + .type = VID_TYPE_CAPTURE, + .hardware = VID_HARDWARE_PWC, + .release = video_device_release, + .fops = &pwc_fops, + .minor = -1, +}; + +/***************************************************************************/ + +/* Okay, this is some magic that I worked out and the reasoning behind it... + + The biggest problem with any USB device is of course: "what to do + when the user unplugs the device while it is in use by an application?" + We have several options: + 1) Curse them with the 7 plagues when they do (requires divine intervention) + 2) Tell them not to (won't work: they'll do it anyway) + 3) Oops the kernel (this will have a negative effect on a user's uptime) + 4) Do something sensible. + + Of course, we go for option 4. + + It happens that this device will be linked to two times, once from + usb_device and once from the video_device in their respective 'private' + pointers. This is done when the device is probed() and all initialization + succeeded. The pwc_device struct links back to both structures. + + When a device is unplugged while in use it will be removed from the + list of known USB devices; I also de-register it as a V4L device, but + unfortunately I can't free the memory since the struct is still in use + by the file descriptor. This free-ing is then deferend until the first + opportunity. Crude, but it works. + + A small 'advantage' is that if a user unplugs the cam and plugs it back + in, it should get assigned the same video device minor, but unfortunately + it's non-trivial to re-link the cam back to the video device... (that + would surely be magic! :)) +*/ + +/***************************************************************************/ +/* Private functions */ + +/* Here we want the physical address of the memory. + * This is used when initializing the contents of the area. + */ +static inline unsigned long kvirt_to_pa(unsigned long adr) +{ + unsigned long kva, ret; + + kva = (unsigned long) page_address(vmalloc_to_page((void *)adr)); + kva |= adr & (PAGE_SIZE-1); /* restore the offset */ + ret = __pa(kva); + return ret; +} + +static void * rvmalloc(unsigned long size) +{ + void * mem; + unsigned long adr; + + size=PAGE_ALIGN(size); + mem=vmalloc_32(size); + if (mem) + { + memset(mem, 0, size); /* Clear the ram out, no junk to the user */ + adr=(unsigned long) mem; + while (size > 0) + { + SetPageReserved(vmalloc_to_page((void *)adr)); + adr+=PAGE_SIZE; + size-=PAGE_SIZE; + } + } + return mem; +} + +static void rvfree(void * mem, unsigned long size) +{ + unsigned long adr; + + if (mem) + { + adr=(unsigned long) mem; + while ((long) size > 0) + { + ClearPageReserved(vmalloc_to_page((void *)adr)); + adr+=PAGE_SIZE; + size-=PAGE_SIZE; + } + vfree(mem); + } +} + + + + +static int pwc_allocate_buffers(struct pwc_device *pdev) +{ + int i; + void *kbuf; + + Trace(TRACE_MEMORY, ">> pwc_allocate_buffers(pdev = 0x%p)\n", pdev); + + if (pdev == NULL) + return -ENXIO; + +#ifdef PWC_MAGIC + if (pdev->magic != PWC_MAGIC) { + Err("allocate_buffers(): magic failed.\n"); + return -ENXIO; + } +#endif + /* Allocate Isochronous pipe buffers */ + for (i = 0; i < MAX_ISO_BUFS; i++) { + if (pdev->sbuf[i].data == NULL) { + kbuf = kmalloc(ISO_BUFFER_SIZE, GFP_KERNEL); + if (kbuf == NULL) { + Err("Failed to allocate iso buffer %d.\n", i); + return -ENOMEM; + } + Trace(TRACE_MEMORY, "Allocated iso buffer at %p.\n", kbuf); + pdev->sbuf[i].data = kbuf; + memset(kbuf, 0, ISO_BUFFER_SIZE); + } + } + + /* Allocate frame buffer structure */ + if (pdev->fbuf == NULL) { + kbuf = kmalloc(default_fbufs * sizeof(struct pwc_frame_buf), GFP_KERNEL); + if (kbuf == NULL) { + Err("Failed to allocate frame buffer structure.\n"); + return -ENOMEM; + } + Trace(TRACE_MEMORY, "Allocated frame buffer structure at %p.\n", kbuf); + pdev->fbuf = kbuf; + memset(kbuf, 0, default_fbufs * sizeof(struct pwc_frame_buf)); + } + /* create frame buffers, and make circular ring */ + for (i = 0; i < default_fbufs; i++) { + if (pdev->fbuf[i].data == NULL) { + kbuf = vmalloc(PWC_FRAME_SIZE); /* need vmalloc since frame buffer > 128K */ + if (kbuf == NULL) { + Err("Failed to allocate frame buffer %d.\n", i); + return -ENOMEM; + } + Trace(TRACE_MEMORY, "Allocated frame buffer %d at %p.\n", i, kbuf); + pdev->fbuf[i].data = kbuf; + memset(kbuf, 128, PWC_FRAME_SIZE); + } + } + + /* Allocate decompressor table space */ + kbuf = NULL; + switch (pdev->type) + { + case 675: + case 680: + case 690: + case 720: + case 730: + case 740: + case 750: +#if 0 + Trace(TRACE_MEMORY,"private_data(%zu)\n",sizeof(struct pwc_dec23_private)); + kbuf = kmalloc(sizeof(struct pwc_dec23_private), GFP_KERNEL); /* Timon & Kiara */ + break; + case 645: + case 646: + /* TODO & FIXME */ + kbuf = kmalloc(sizeof(struct pwc_dec23_private), GFP_KERNEL); + break; +#endif + ; + } + pdev->decompress_data = kbuf; + + /* Allocate image buffer; double buffer for mmap() */ + kbuf = rvmalloc(default_mbufs * pdev->len_per_image); + if (kbuf == NULL) { + Err("Failed to allocate image buffer(s). needed (%d)\n",default_mbufs * pdev->len_per_image); + return -ENOMEM; + } + Trace(TRACE_MEMORY, "Allocated image buffer at %p.\n", kbuf); + pdev->image_data = kbuf; + for (i = 0; i < default_mbufs; i++) + pdev->image_ptr[i] = kbuf + i * pdev->len_per_image; + for (; i < MAX_IMAGES; i++) + pdev->image_ptr[i] = NULL; + + kbuf = NULL; + + Trace(TRACE_MEMORY, "<< pwc_allocate_buffers()\n"); + return 0; +} + +static void pwc_free_buffers(struct pwc_device *pdev) +{ + int i; + + Trace(TRACE_MEMORY, "Entering free_buffers(%p).\n", pdev); + + if (pdev == NULL) + return; +#ifdef PWC_MAGIC + if (pdev->magic != PWC_MAGIC) { + Err("free_buffers(): magic failed.\n"); + return; + } +#endif + + /* Release Iso-pipe buffers */ + for (i = 0; i < MAX_ISO_BUFS; i++) + if (pdev->sbuf[i].data != NULL) { + Trace(TRACE_MEMORY, "Freeing ISO buffer at %p.\n", pdev->sbuf[i].data); + kfree(pdev->sbuf[i].data); + pdev->sbuf[i].data = NULL; + } + + /* The same for frame buffers */ + if (pdev->fbuf != NULL) { + for (i = 0; i < default_fbufs; i++) { + if (pdev->fbuf[i].data != NULL) { + Trace(TRACE_MEMORY, "Freeing frame buffer %d at %p.\n", i, pdev->fbuf[i].data); + vfree(pdev->fbuf[i].data); + pdev->fbuf[i].data = NULL; + } + } + kfree(pdev->fbuf); + pdev->fbuf = NULL; + } + + /* Intermediate decompression buffer & tables */ + if (pdev->decompress_data != NULL) { + Trace(TRACE_MEMORY, "Freeing decompression buffer at %p.\n", pdev->decompress_data); + kfree(pdev->decompress_data); + pdev->decompress_data = NULL; + } + pdev->decompressor = NULL; + + /* Release image buffers */ + if (pdev->image_data != NULL) { + Trace(TRACE_MEMORY, "Freeing image buffer at %p.\n", pdev->image_data); + rvfree(pdev->image_data, default_mbufs * pdev->len_per_image); + } + pdev->image_data = NULL; + + Trace(TRACE_MEMORY, "Leaving free_buffers().\n"); +} + +/* The frame & image buffer mess. + + Yes, this is a mess. Well, it used to be simple, but alas... In this + module, 3 buffers schemes are used to get the data from the USB bus to + the user program. The first scheme involves the ISO buffers (called thus + since they transport ISO data from the USB controller), and not really + interesting. Suffices to say the data from this buffer is quickly + gathered in an interrupt handler (pwc_isoc_handler) and placed into the + frame buffer. + + The frame buffer is the second scheme, and is the central element here. + It collects the data from a single frame from the camera (hence, the + name). Frames are delimited by the USB camera with a short USB packet, + so that's easy to detect. The frame buffers form a list that is filled + by the camera+USB controller and drained by the user process through + either read() or mmap(). + + The image buffer is the third scheme, in which frames are decompressed + and converted into planar format. For mmap() there is more than + one image buffer available. + + The frame buffers provide the image buffering. In case the user process + is a bit slow, this introduces lag and some undesired side-effects. + The problem arises when the frame buffer is full. I used to drop the last + frame, which makes the data in the queue stale very quickly. But dropping + the frame at the head of the queue proved to be a litte bit more difficult. + I tried a circular linked scheme, but this introduced more problems than + it solved. + + Because filling and draining are completely asynchronous processes, this + requires some fiddling with pointers and mutexes. + + Eventually, I came up with a system with 2 lists: an 'empty' frame list + and a 'full' frame list: + * Initially, all frame buffers but one are on the 'empty' list; the one + remaining buffer is our initial fill frame. + * If a frame is needed for filling, we try to take it from the 'empty' + list, unless that list is empty, in which case we take the buffer at + the head of the 'full' list. + * When our fill buffer has been filled, it is appended to the 'full' + list. + * If a frame is needed by read() or mmap(), it is taken from the head of + the 'full' list, handled, and then appended to the 'empty' list. If no + buffer is present on the 'full' list, we wait. + The advantage is that the buffer that is currently being decompressed/ + converted, is on neither list, and thus not in our way (any other scheme + I tried had the problem of old data lingering in the queue). + + Whatever strategy you choose, it always remains a tradeoff: with more + frame buffers the chances of a missed frame are reduced. On the other + hand, on slower machines it introduces lag because the queue will + always be full. + */ + +/** + \brief Find next frame buffer to fill. Take from empty or full list, whichever comes first. + */ +static inline int pwc_next_fill_frame(struct pwc_device *pdev) +{ + int ret; + unsigned long flags; + + ret = 0; + spin_lock_irqsave(&pdev->ptrlock, flags); + if (pdev->fill_frame != NULL) { + /* append to 'full' list */ + if (pdev->full_frames == NULL) { + pdev->full_frames = pdev->fill_frame; + pdev->full_frames_tail = pdev->full_frames; + } + else { + pdev->full_frames_tail->next = pdev->fill_frame; + pdev->full_frames_tail = pdev->fill_frame; + } + } + if (pdev->empty_frames != NULL) { + /* We have empty frames available. That's easy */ + pdev->fill_frame = pdev->empty_frames; + pdev->empty_frames = pdev->empty_frames->next; + } + else { + /* Hmm. Take it from the full list */ +#if PWC_DEBUG + /* sanity check */ + if (pdev->full_frames == NULL) { + Err("Neither empty or full frames available!\n"); + spin_unlock_irqrestore(&pdev->ptrlock, flags); + return -EINVAL; + } +#endif + pdev->fill_frame = pdev->full_frames; + pdev->full_frames = pdev->full_frames->next; + ret = 1; + } + pdev->fill_frame->next = NULL; +#if PWC_DEBUG + Trace(TRACE_SEQUENCE, "Assigning sequence number %d.\n", pdev->sequence); + pdev->fill_frame->sequence = pdev->sequence++; +#endif + spin_unlock_irqrestore(&pdev->ptrlock, flags); + return ret; +} + + +/** + \brief Reset all buffers, pointers and lists, except for the image_used[] buffer. + + If the image_used[] buffer is cleared too, mmap()/VIDIOCSYNC will run into trouble. + */ +static void pwc_reset_buffers(struct pwc_device *pdev) +{ + int i; + unsigned long flags; + + spin_lock_irqsave(&pdev->ptrlock, flags); + pdev->full_frames = NULL; + pdev->full_frames_tail = NULL; + for (i = 0; i < default_fbufs; i++) { + pdev->fbuf[i].filled = 0; + if (i > 0) + pdev->fbuf[i].next = &pdev->fbuf[i - 1]; + else + pdev->fbuf->next = NULL; + } + pdev->empty_frames = &pdev->fbuf[default_fbufs - 1]; + pdev->empty_frames_tail = pdev->fbuf; + pdev->read_frame = NULL; + pdev->fill_frame = pdev->empty_frames; + pdev->empty_frames = pdev->empty_frames->next; + + pdev->image_read_pos = 0; + pdev->fill_image = 0; + spin_unlock_irqrestore(&pdev->ptrlock, flags); +} + + +/** + \brief Do all the handling for getting one frame: get pointer, decompress, advance pointers. + */ +static int pwc_handle_frame(struct pwc_device *pdev) +{ + int ret = 0; + unsigned long flags; + + spin_lock_irqsave(&pdev->ptrlock, flags); + /* First grab our read_frame; this is removed from all lists, so + we can release the lock after this without problems */ + if (pdev->read_frame != NULL) { + /* This can't theoretically happen */ + Err("Huh? Read frame still in use?\n"); + } + else { + if (pdev->full_frames == NULL) { + Err("Woops. No frames ready.\n"); + } + else { + pdev->read_frame = pdev->full_frames; + pdev->full_frames = pdev->full_frames->next; + pdev->read_frame->next = NULL; + } + + if (pdev->read_frame != NULL) { +#if PWC_DEBUG + Trace(TRACE_SEQUENCE, "Decompressing frame %d\n", pdev->read_frame->sequence); +#endif + /* Decompression is a lenghty process, so it's outside of the lock. + This gives the isoc_handler the opportunity to fill more frames + in the mean time. + */ + spin_unlock_irqrestore(&pdev->ptrlock, flags); + ret = pwc_decompress(pdev); + spin_lock_irqsave(&pdev->ptrlock, flags); + + /* We're done with read_buffer, tack it to the end of the empty buffer list */ + if (pdev->empty_frames == NULL) { + pdev->empty_frames = pdev->read_frame; + pdev->empty_frames_tail = pdev->empty_frames; + } + else { + pdev->empty_frames_tail->next = pdev->read_frame; + pdev->empty_frames_tail = pdev->read_frame; + } + pdev->read_frame = NULL; + } + } + spin_unlock_irqrestore(&pdev->ptrlock, flags); + return ret; +} + +/** + \brief Advance pointers of image buffer (after each user request) +*/ +static inline void pwc_next_image(struct pwc_device *pdev) +{ + pdev->image_used[pdev->fill_image] = 0; + pdev->fill_image = (pdev->fill_image + 1) % default_mbufs; +} + + +/* This gets called for the Isochronous pipe (video). This is done in + * interrupt time, so it has to be fast, not crash, and not stall. Neat. + */ +static void pwc_isoc_handler(struct urb *urb, struct pt_regs *regs) +{ + struct pwc_device *pdev; + int i, fst, flen; + int awake; + struct pwc_frame_buf *fbuf; + unsigned char *fillptr = NULL, *iso_buf = NULL; + + awake = 0; + pdev = (struct pwc_device *)urb->context; + if (pdev == NULL) { + Err("isoc_handler() called with NULL device?!\n"); + return; + } +#ifdef PWC_MAGIC + if (pdev->magic != PWC_MAGIC) { + Err("isoc_handler() called with bad magic!\n"); + return; + } +#endif + if (urb->status == -ENOENT || urb->status == -ECONNRESET) { + Trace(TRACE_OPEN, "pwc_isoc_handler(): URB (%p) unlinked %ssynchronuously.\n", urb, urb->status == -ENOENT ? "" : "a"); + return; + } + if (urb->status != -EINPROGRESS && urb->status != 0) { + const char *errmsg; + + errmsg = "Unknown"; + switch(urb->status) { + case -ENOSR: errmsg = "Buffer error (overrun)"; break; + case -EPIPE: errmsg = "Stalled (device not responding)"; break; + case -EOVERFLOW: errmsg = "Babble (bad cable?)"; break; + case -EPROTO: errmsg = "Bit-stuff error (bad cable?)"; break; + case -EILSEQ: errmsg = "CRC/Timeout (could be anything)"; break; + case -ETIMEDOUT: errmsg = "NAK (device does not respond)"; break; + } + Trace(TRACE_FLOW, "pwc_isoc_handler() called with status %d [%s].\n", urb->status, errmsg); + /* Give up after a number of contiguous errors on the USB bus. + Appearantly something is wrong so we simulate an unplug event. + */ + if (++pdev->visoc_errors > MAX_ISOC_ERRORS) + { + Info("Too many ISOC errors, bailing out.\n"); + pdev->error_status = EIO; + awake = 1; + wake_up_interruptible(&pdev->frameq); + } + goto handler_end; // ugly, but practical + } + + fbuf = pdev->fill_frame; + if (fbuf == NULL) { + Err("pwc_isoc_handler without valid fill frame.\n"); + awake = 1; + goto handler_end; + } + else { + fillptr = fbuf->data + fbuf->filled; + } + + /* Reset ISOC error counter. We did get here, after all. */ + pdev->visoc_errors = 0; + + /* vsync: 0 = don't copy data + 1 = sync-hunt + 2 = synched + */ + /* Compact data */ + for (i = 0; i < urb->number_of_packets; i++) { + fst = urb->iso_frame_desc[i].status; + flen = urb->iso_frame_desc[i].actual_length; + iso_buf = urb->transfer_buffer + urb->iso_frame_desc[i].offset; + if (fst == 0) { + if (flen > 0) { /* if valid data... */ + if (pdev->vsync > 0) { /* ...and we are not sync-hunting... */ + pdev->vsync = 2; + + /* ...copy data to frame buffer, if possible */ + if (flen + fbuf->filled > pdev->frame_total_size) { + Trace(TRACE_FLOW, "Frame buffer overflow (flen = %d, frame_total_size = %d).\n", flen, pdev->frame_total_size); + pdev->vsync = 0; /* Hmm, let's wait for an EOF (end-of-frame) */ + pdev->vframes_error++; + } + else { + memmove(fillptr, iso_buf, flen); + fillptr += flen; + } + } + fbuf->filled += flen; + } /* ..flen > 0 */ + + if (flen < pdev->vlast_packet_size) { + /* Shorter packet... We probably have the end of an image-frame; + wake up read() process and let select()/poll() do something. + Decompression is done in user time over there. + */ + if (pdev->vsync == 2) { + /* The ToUCam Fun CMOS sensor causes the firmware to send 2 or 3 bogus + frames on the USB wire after an exposure change. This conditition is + however detected in the cam and a bit is set in the header. + */ + if (pdev->type == 730) { + unsigned char *ptr = (unsigned char *)fbuf->data; + + if (ptr[1] == 1 && ptr[0] & 0x10) { +#if PWC_DEBUG + Debug("Hyundai CMOS sensor bug. Dropping frame %d.\n", fbuf->sequence); +#endif + pdev->drop_frames += 2; + pdev->vframes_error++; + } + if ((ptr[0] ^ pdev->vmirror) & 0x01) { + if (ptr[0] & 0x01) + Info("Snapshot button pressed.\n"); + else + Info("Snapshot button released.\n"); + } + if ((ptr[0] ^ pdev->vmirror) & 0x02) { + if (ptr[0] & 0x02) + Info("Image is mirrored.\n"); + else + Info("Image is normal.\n"); + } + pdev->vmirror = ptr[0] & 0x03; + /* Sometimes the trailer of the 730 is still sent as a 4 byte packet + after a short frame; this condition is filtered out specifically. A 4 byte + frame doesn't make sense anyway. + So we get either this sequence: + drop_bit set -> 4 byte frame -> short frame -> good frame + Or this one: + drop_bit set -> short frame -> good frame + So we drop either 3 or 2 frames in all! + */ + if (fbuf->filled == 4) + pdev->drop_frames++; + } + + /* In case we were instructed to drop the frame, do so silently. + The buffer pointers are not updated either (but the counters are reset below). + */ + if (pdev->drop_frames > 0) + pdev->drop_frames--; + else { + /* Check for underflow first */ + if (fbuf->filled < pdev->frame_total_size) { + Trace(TRACE_FLOW, "Frame buffer underflow (%d bytes); discarded.\n", fbuf->filled); + pdev->vframes_error++; + } + else { + /* Send only once per EOF */ + awake = 1; /* delay wake_ups */ + + /* Find our next frame to fill. This will always succeed, since we + * nick a frame from either empty or full list, but if we had to + * take it from the full list, it means a frame got dropped. + */ + if (pwc_next_fill_frame(pdev)) { + pdev->vframes_dumped++; + if ((pdev->vframe_count > FRAME_LOWMARK) && (pwc_trace & TRACE_FLOW)) { + if (pdev->vframes_dumped < 20) + Trace(TRACE_FLOW, "Dumping frame %d.\n", pdev->vframe_count); + if (pdev->vframes_dumped == 20) + Trace(TRACE_FLOW, "Dumping frame %d (last message).\n", pdev->vframe_count); + } + } + fbuf = pdev->fill_frame; + } + } /* !drop_frames */ + pdev->vframe_count++; + } + fbuf->filled = 0; + fillptr = fbuf->data; + pdev->vsync = 1; + } /* .. flen < last_packet_size */ + pdev->vlast_packet_size = flen; + } /* ..status == 0 */ +#if PWC_DEBUG + /* This is normally not interesting to the user, unless you are really debugging something */ + else { + static int iso_error = 0; + iso_error++; + if (iso_error < 20) + Trace(TRACE_FLOW, "Iso frame %d of USB has error %d\n", i, fst); + } +#endif + } + +handler_end: + if (awake) + wake_up_interruptible(&pdev->frameq); + + urb->dev = pdev->udev; + i = usb_submit_urb(urb, GFP_ATOMIC); + if (i != 0) + Err("Error (%d) re-submitting urb in pwc_isoc_handler.\n", i); +} + + +static int pwc_isoc_init(struct pwc_device *pdev) +{ + struct usb_device *udev; + struct urb *urb; + int i, j, ret; + + struct usb_interface *intf; + struct usb_host_interface *idesc = NULL; + + if (pdev == NULL) + return -EFAULT; + if (pdev->iso_init) + return 0; + pdev->vsync = 0; + udev = pdev->udev; + + /* Get the current alternate interface, adjust packet size */ + if (!udev->actconfig) + return -EFAULT; + + intf = usb_ifnum_to_if(udev, 0); + if (intf) + idesc = usb_altnum_to_altsetting(intf, pdev->valternate); + + if (!idesc) + return -EFAULT; + + /* Search video endpoint */ + pdev->vmax_packet_size = -1; + for (i = 0; i < idesc->desc.bNumEndpoints; i++) + if ((idesc->endpoint[i].desc.bEndpointAddress & 0xF) == pdev->vendpoint) { + pdev->vmax_packet_size = le16_to_cpu(idesc->endpoint[i].desc.wMaxPacketSize); + break; + } + + if (pdev->vmax_packet_size < 0 || pdev->vmax_packet_size > ISO_MAX_FRAME_SIZE) { + Err("Failed to find packet size for video endpoint in current alternate setting.\n"); + return -ENFILE; /* Odd error, that should be noticeable */ + } + + /* Set alternate interface */ + ret = 0; + Trace(TRACE_OPEN, "Setting alternate interface %d\n", pdev->valternate); + ret = usb_set_interface(pdev->udev, 0, pdev->valternate); + if (ret < 0) + return ret; + + for (i = 0; i < MAX_ISO_BUFS; i++) { + urb = usb_alloc_urb(ISO_FRAMES_PER_DESC, GFP_KERNEL); + if (urb == NULL) { + Err("Failed to allocate urb %d\n", i); + ret = -ENOMEM; + break; + } + pdev->sbuf[i].urb = urb; + Trace(TRACE_MEMORY, "Allocated URB at 0x%p\n", urb); + } + if (ret) { + /* De-allocate in reverse order */ + while (i >= 0) { + if (pdev->sbuf[i].urb != NULL) + usb_free_urb(pdev->sbuf[i].urb); + pdev->sbuf[i].urb = NULL; + i--; + } + return ret; + } + + /* init URB structure */ + for (i = 0; i < MAX_ISO_BUFS; i++) { + urb = pdev->sbuf[i].urb; + + urb->interval = 1; // devik + urb->dev = udev; + urb->pipe = usb_rcvisocpipe(udev, pdev->vendpoint); + urb->transfer_flags = URB_ISO_ASAP; + urb->transfer_buffer = pdev->sbuf[i].data; + urb->transfer_buffer_length = ISO_BUFFER_SIZE; + urb->complete = pwc_isoc_handler; + urb->context = pdev; + urb->start_frame = 0; + urb->number_of_packets = ISO_FRAMES_PER_DESC; + for (j = 0; j < ISO_FRAMES_PER_DESC; j++) { + urb->iso_frame_desc[j].offset = j * ISO_MAX_FRAME_SIZE; + urb->iso_frame_desc[j].length = pdev->vmax_packet_size; + } + } + + /* link */ + for (i = 0; i < MAX_ISO_BUFS; i++) { + ret = usb_submit_urb(pdev->sbuf[i].urb, GFP_KERNEL); + if (ret) + Err("isoc_init() submit_urb %d failed with error %d\n", i, ret); + else + Trace(TRACE_MEMORY, "URB 0x%p submitted.\n", pdev->sbuf[i].urb); + } + + /* All is done... */ + pdev->iso_init = 1; + Trace(TRACE_OPEN, "<< pwc_isoc_init()\n"); + return 0; +} + +static void pwc_isoc_cleanup(struct pwc_device *pdev) +{ + int i; + + Trace(TRACE_OPEN, ">> pwc_isoc_cleanup()\n"); + if (pdev == NULL) + return; + + /* Unlinking ISOC buffers one by one */ + for (i = 0; i < MAX_ISO_BUFS; i++) { + struct urb *urb; + + urb = pdev->sbuf[i].urb; + if (urb != 0) { + if (pdev->iso_init) { + Trace(TRACE_MEMORY, "Unlinking URB %p\n", urb); + usb_kill_urb(urb); + } + Trace(TRACE_MEMORY, "Freeing URB\n"); + usb_free_urb(urb); + pdev->sbuf[i].urb = NULL; + } + } + + /* Stop camera, but only if we are sure the camera is still there (unplug + is signalled by EPIPE) + */ + if (pdev->error_status && pdev->error_status != EPIPE) { + Trace(TRACE_OPEN, "Setting alternate interface 0.\n"); + usb_set_interface(pdev->udev, 0, 0); + } + + pdev->iso_init = 0; + Trace(TRACE_OPEN, "<< pwc_isoc_cleanup()\n"); +} + +int pwc_try_video_mode(struct pwc_device *pdev, int width, int height, int new_fps, int new_compression, int new_snapshot) +{ + int ret, start; + + /* Stop isoc stuff */ + pwc_isoc_cleanup(pdev); + /* Reset parameters */ + pwc_reset_buffers(pdev); + /* Try to set video mode... */ + start = ret = pwc_set_video_mode(pdev, width, height, new_fps, new_compression, new_snapshot); + if (ret) { + Trace(TRACE_FLOW, "pwc_set_video_mode attempt 1 failed.\n"); + /* That failed... restore old mode (we know that worked) */ + start = pwc_set_video_mode(pdev, pdev->view.x, pdev->view.y, pdev->vframes, pdev->vcompression, pdev->vsnapshot); + if (start) { + Trace(TRACE_FLOW, "pwc_set_video_mode attempt 2 failed.\n"); + } + } + if (start == 0) + { + if (pwc_isoc_init(pdev) < 0) + { + Info("Failed to restart ISOC transfers in pwc_try_video_mode.\n"); + ret = -EAGAIN; /* let's try again, who knows if it works a second time */ + } + } + pdev->drop_frames++; /* try to avoid garbage during switch */ + return ret; /* Return original error code */ +} + + +/***************************************************************************/ +/* Video4Linux functions */ + +static int pwc_video_open(struct inode *inode, struct file *file) +{ + int i; + struct video_device *vdev = video_devdata(file); + struct pwc_device *pdev; + + Trace(TRACE_OPEN, ">> video_open called(vdev = 0x%p).\n", vdev); + + pdev = (struct pwc_device *)vdev->priv; + if (pdev == NULL) + BUG(); + if (pdev->vopen) + return -EBUSY; + + down(&pdev->modlock); + if (!pdev->usb_init) { + Trace(TRACE_OPEN, "Doing first time initialization.\n"); + pdev->usb_init = 1; + + if (pwc_trace & TRACE_OPEN) + { + /* Query sensor type */ + const char *sensor_type = NULL; + int ret; + + ret = pwc_get_cmos_sensor(pdev, &i); + if (ret >= 0) + { + switch(i) { + case 0x00: sensor_type = "Hyundai CMOS sensor"; break; + case 0x20: sensor_type = "Sony CCD sensor + TDA8787"; break; + case 0x2E: sensor_type = "Sony CCD sensor + Exas 98L59"; break; + case 0x2F: sensor_type = "Sony CCD sensor + ADI 9804"; break; + case 0x30: sensor_type = "Sharp CCD sensor + TDA8787"; break; + case 0x3E: sensor_type = "Sharp CCD sensor + Exas 98L59"; break; + case 0x3F: sensor_type = "Sharp CCD sensor + ADI 9804"; break; + case 0x40: sensor_type = "UPA 1021 sensor"; break; + case 0x100: sensor_type = "VGA sensor"; break; + case 0x101: sensor_type = "PAL MR sensor"; break; + default: sensor_type = "unknown type of sensor"; break; + } + } + if (sensor_type != NULL) + Info("This %s camera is equipped with a %s (%d).\n", pdev->vdev->name, sensor_type, i); + } + } + + /* Turn on camera */ + if (power_save) { + i = pwc_camera_power(pdev, 1); + if (i < 0) + Info("Failed to restore power to the camera! (%d)\n", i); + } + /* Set LED on/off time */ + if (pwc_set_leds(pdev, led_on, led_off) < 0) + Info("Failed to set LED on/off time.\n"); + + pwc_construct(pdev); /* set min/max sizes correct */ + + /* So far, so good. Allocate memory. */ + i = pwc_allocate_buffers(pdev); + if (i < 0) { + Trace(TRACE_OPEN, "Failed to allocate buffer memory.\n"); + up(&pdev->modlock); + return i; + } + + /* Reset buffers & parameters */ + pwc_reset_buffers(pdev); + for (i = 0; i < default_mbufs; i++) + pdev->image_used[i] = 0; + pdev->vframe_count = 0; + pdev->vframes_dumped = 0; + pdev->vframes_error = 0; + pdev->visoc_errors = 0; + pdev->error_status = 0; +#if PWC_DEBUG + pdev->sequence = 0; +#endif + pwc_construct(pdev); /* set min/max sizes correct */ + + /* Set some defaults */ + pdev->vsnapshot = 0; + + /* Start iso pipe for video; first try the last used video size + (or the default one); if that fails try QCIF/10 or QSIF/10; + it that fails too, give up. + */ + i = pwc_set_video_mode(pdev, pwc_image_sizes[pdev->vsize].x, pwc_image_sizes[pdev->vsize].y, pdev->vframes, pdev->vcompression, 0); + if (i) { + Trace(TRACE_OPEN, "First attempt at set_video_mode failed.\n"); + if (pdev->type == 730 || pdev->type == 740 || pdev->type == 750) + i = pwc_set_video_mode(pdev, pwc_image_sizes[PSZ_QSIF].x, pwc_image_sizes[PSZ_QSIF].y, 10, pdev->vcompression, 0); + else + i = pwc_set_video_mode(pdev, pwc_image_sizes[PSZ_QCIF].x, pwc_image_sizes[PSZ_QCIF].y, 10, pdev->vcompression, 0); + } + if (i) { + Trace(TRACE_OPEN, "Second attempt at set_video_mode failed.\n"); + up(&pdev->modlock); + return i; + } + + i = pwc_isoc_init(pdev); + if (i) { + Trace(TRACE_OPEN, "Failed to init ISOC stuff = %d.\n", i); + up(&pdev->modlock); + return i; + } + + pdev->vopen++; + file->private_data = vdev; + up(&pdev->modlock); + Trace(TRACE_OPEN, "<< video_open() returns 0.\n"); + return 0; +} + +/* Note that all cleanup is done in the reverse order as in _open */ +static int pwc_video_close(struct inode *inode, struct file *file) +{ + struct video_device *vdev = file->private_data; + struct pwc_device *pdev; + int i; + + Trace(TRACE_OPEN, ">> video_close called(vdev = 0x%p).\n", vdev); + + pdev = (struct pwc_device *)vdev->priv; + if (pdev->vopen == 0) + Info("video_close() called on closed device?\n"); + + /* Dump statistics, but only if a reasonable amount of frames were + processed (to prevent endless log-entries in case of snap-shot + programs) + */ + if (pdev->vframe_count > 20) + Info("Closing video device: %d frames received, dumped %d frames, %d frames with errors.\n", pdev->vframe_count, pdev->vframes_dumped, pdev->vframes_error); + + switch (pdev->type) + { + case 675: + case 680: + case 690: + case 720: + case 730: + case 740: + case 750: +/* pwc_dec23_exit(); *//* Timon & Kiara */ + break; + case 645: + case 646: +/* pwc_dec1_exit(); */ + break; + } + + pwc_isoc_cleanup(pdev); + pwc_free_buffers(pdev); + + /* Turn off LEDS and power down camera, but only when not unplugged */ + if (pdev->error_status != EPIPE) { + /* Turn LEDs off */ + if (pwc_set_leds(pdev, 0, 0) < 0) + Info("Failed to set LED on/off time.\n"); + if (power_save) { + i = pwc_camera_power(pdev, 0); + if (i < 0) + Err("Failed to power down camera (%d)\n", i); + } + } + pdev->vopen = 0; + Trace(TRACE_OPEN, "<< video_close()\n"); + return 0; +} + +/* + * FIXME: what about two parallel reads ???? + * ANSWER: Not supported. You can't open the device more than once, + despite what the V4L1 interface says. First, I don't see + the need, second there's no mechanism of alerting the + 2nd/3rd/... process of events like changing image size. + And I don't see the point of blocking that for the + 2nd/3rd/... process. + In multi-threaded environments reading parallel from any + device is tricky anyhow. + */ + +static ssize_t pwc_video_read(struct file *file, char __user * buf, + size_t count, loff_t *ppos) +{ + struct video_device *vdev = file->private_data; + struct pwc_device *pdev; + int noblock = file->f_flags & O_NONBLOCK; + DECLARE_WAITQUEUE(wait, current); + int bytes_to_read; + + Trace(TRACE_READ, "video_read(0x%p, %p, %zu) called.\n", vdev, buf, count); + if (vdev == NULL) + return -EFAULT; + pdev = vdev->priv; + if (pdev == NULL) + return -EFAULT; + if (pdev->error_status) + return -pdev->error_status; /* Something happened, report what. */ + + /* In case we're doing partial reads, we don't have to wait for a frame */ + if (pdev->image_read_pos == 0) { + /* Do wait queueing according to the (doc)book */ + add_wait_queue(&pdev->frameq, &wait); + while (pdev->full_frames == NULL) { + /* Check for unplugged/etc. here */ + if (pdev->error_status) { + remove_wait_queue(&pdev->frameq, &wait); + set_current_state(TASK_RUNNING); + return -pdev->error_status ; + } + if (noblock) { + remove_wait_queue(&pdev->frameq, &wait); + set_current_state(TASK_RUNNING); + return -EWOULDBLOCK; + } + if (signal_pending(current)) { + remove_wait_queue(&pdev->frameq, &wait); + set_current_state(TASK_RUNNING); + return -ERESTARTSYS; + } + schedule(); + set_current_state(TASK_INTERRUPTIBLE); + } + remove_wait_queue(&pdev->frameq, &wait); + set_current_state(TASK_RUNNING); + + /* Decompress and release frame */ + if (pwc_handle_frame(pdev)) + return -EFAULT; + } + + Trace(TRACE_READ, "Copying data to user space.\n"); + if (pdev->vpalette == VIDEO_PALETTE_RAW) + bytes_to_read = pdev->frame_size; + else + bytes_to_read = pdev->view.size; + + /* copy bytes to user space; we allow for partial reads */ + if (count + pdev->image_read_pos > bytes_to_read) + count = bytes_to_read - pdev->image_read_pos; + if (copy_to_user(buf, pdev->image_ptr[pdev->fill_image] + pdev->image_read_pos, count)) + return -EFAULT; + pdev->image_read_pos += count; + if (pdev->image_read_pos >= bytes_to_read) { /* All data has been read */ + pdev->image_read_pos = 0; + pwc_next_image(pdev); + } + return count; +} + +static unsigned int pwc_video_poll(struct file *file, poll_table *wait) +{ + struct video_device *vdev = file->private_data; + struct pwc_device *pdev; + + if (vdev == NULL) + return -EFAULT; + pdev = vdev->priv; + if (pdev == NULL) + return -EFAULT; + + poll_wait(file, &pdev->frameq, wait); + if (pdev->error_status) + return POLLERR; + if (pdev->full_frames != NULL) /* we have frames waiting */ + return (POLLIN | POLLRDNORM); + + return 0; +} + +static int pwc_video_do_ioctl(struct inode *inode, struct file *file, + unsigned int cmd, void *arg) +{ + struct video_device *vdev = file->private_data; + struct pwc_device *pdev; + DECLARE_WAITQUEUE(wait, current); + + if (vdev == NULL) + return -EFAULT; + pdev = vdev->priv; + if (pdev == NULL) + return -EFAULT; + + switch (cmd) { + /* Query cabapilities */ + case VIDIOCGCAP: + { + struct video_capability *caps = arg; + + strcpy(caps->name, vdev->name); + caps->type = VID_TYPE_CAPTURE; + caps->channels = 1; + caps->audios = 1; + caps->minwidth = pdev->view_min.x; + caps->minheight = pdev->view_min.y; + caps->maxwidth = pdev->view_max.x; + caps->maxheight = pdev->view_max.y; + break; + } + + /* Channel functions (simulate 1 channel) */ + case VIDIOCGCHAN: + { + struct video_channel *v = arg; + + if (v->channel != 0) + return -EINVAL; + v->flags = 0; + v->tuners = 0; + v->type = VIDEO_TYPE_CAMERA; + strcpy(v->name, "Webcam"); + return 0; + } + + case VIDIOCSCHAN: + { + /* The spec says the argument is an integer, but + the bttv driver uses a video_channel arg, which + makes sense becasue it also has the norm flag. + */ + struct video_channel *v = arg; + if (v->channel != 0) + return -EINVAL; + return 0; + } + + + /* Picture functions; contrast etc. */ + case VIDIOCGPICT: + { + struct video_picture *p = arg; + int val; + + val = pwc_get_brightness(pdev); + if (val >= 0) + p->brightness = val; + else + p->brightness = 0xffff; + val = pwc_get_contrast(pdev); + if (val >= 0) + p->contrast = val; + else + p->contrast = 0xffff; + /* Gamma, Whiteness, what's the difference? :) */ + val = pwc_get_gamma(pdev); + if (val >= 0) + p->whiteness = val; + else + p->whiteness = 0xffff; + val = pwc_get_saturation(pdev); + if (val >= 0) + p->colour = val; + else + p->colour = 0xffff; + p->depth = 24; + p->palette = pdev->vpalette; + p->hue = 0xFFFF; /* N/A */ + break; + } + + case VIDIOCSPICT: + { + struct video_picture *p = arg; + /* + * FIXME: Suppose we are mid read + ANSWER: No problem: the firmware of the camera + can handle brightness/contrast/etc + changes at _any_ time, and the palette + is used exactly once in the uncompress + routine. + */ + pwc_set_brightness(pdev, p->brightness); + pwc_set_contrast(pdev, p->contrast); + pwc_set_gamma(pdev, p->whiteness); + pwc_set_saturation(pdev, p->colour); + if (p->palette && p->palette != pdev->vpalette) { + switch (p->palette) { + case VIDEO_PALETTE_YUV420P: + case VIDEO_PALETTE_RAW: + pdev->vpalette = p->palette; + return pwc_try_video_mode(pdev, pdev->image.x, pdev->image.y, pdev->vframes, pdev->vcompression, pdev->vsnapshot); + break; + default: + return -EINVAL; + break; + } + } + break; + } + + /* Window/size parameters */ + case VIDIOCGWIN: + { + struct video_window *vw = arg; + + vw->x = 0; + vw->y = 0; + vw->width = pdev->view.x; + vw->height = pdev->view.y; + vw->chromakey = 0; + vw->flags = (pdev->vframes << PWC_FPS_SHIFT) | + (pdev->vsnapshot ? PWC_FPS_SNAPSHOT : 0); + break; + } + + case VIDIOCSWIN: + { + struct video_window *vw = arg; + int fps, snapshot, ret; + + fps = (vw->flags & PWC_FPS_FRMASK) >> PWC_FPS_SHIFT; + snapshot = vw->flags & PWC_FPS_SNAPSHOT; + if (fps == 0) + fps = pdev->vframes; + if (pdev->view.x == vw->width && pdev->view.y && fps == pdev->vframes && snapshot == pdev->vsnapshot) + return 0; + ret = pwc_try_video_mode(pdev, vw->width, vw->height, fps, pdev->vcompression, snapshot); + if (ret) + return ret; + break; + } + + /* We don't have overlay support (yet) */ + case VIDIOCGFBUF: + { + struct video_buffer *vb = arg; + + memset(vb,0,sizeof(*vb)); + break; + } + + /* mmap() functions */ + case VIDIOCGMBUF: + { + /* Tell the user program how much memory is needed for a mmap() */ + struct video_mbuf *vm = arg; + int i; + + memset(vm, 0, sizeof(*vm)); + vm->size = default_mbufs * pdev->len_per_image; + vm->frames = default_mbufs; /* double buffering should be enough for most applications */ + for (i = 0; i < default_mbufs; i++) + vm->offsets[i] = i * pdev->len_per_image; + break; + } + + case VIDIOCMCAPTURE: + { + /* Start capture into a given image buffer (called 'frame' in video_mmap structure) */ + struct video_mmap *vm = arg; + + Trace(TRACE_READ, "VIDIOCMCAPTURE: %dx%d, frame %d, format %d\n", vm->width, vm->height, vm->frame, vm->format); + if (vm->frame < 0 || vm->frame >= default_mbufs) + return -EINVAL; + + /* xawtv is nasty. It probes the available palettes + by setting a very small image size and trying + various palettes... The driver doesn't support + such small images, so I'm working around it. + */ + if (vm->format) + { + switch (vm->format) + { + case VIDEO_PALETTE_YUV420P: + case VIDEO_PALETTE_RAW: + break; + default: + return -EINVAL; + break; + } + } + + if ((vm->width != pdev->view.x || vm->height != pdev->view.y) && + (vm->width >= pdev->view_min.x && vm->height >= pdev->view_min.y)) { + int ret; + + Trace(TRACE_OPEN, "VIDIOCMCAPTURE: changing size to please xawtv :-(.\n"); + ret = pwc_try_video_mode(pdev, vm->width, vm->height, pdev->vframes, pdev->vcompression, pdev->vsnapshot); + if (ret) + return ret; + } /* ... size mismatch */ + + /* FIXME: should we lock here? */ + if (pdev->image_used[vm->frame]) + return -EBUSY; /* buffer wasn't available. Bummer */ + pdev->image_used[vm->frame] = 1; + + /* Okay, we're done here. In the SYNC call we wait until a + frame comes available, then expand image into the given + buffer. + In contrast to the CPiA cam the Philips cams deliver a + constant stream, almost like a grabber card. Also, + we have separate buffers for the rawdata and the image, + meaning we can nearly always expand into the requested buffer. + */ + Trace(TRACE_READ, "VIDIOCMCAPTURE done.\n"); + break; + } + + case VIDIOCSYNC: + { + /* The doc says: "Whenever a buffer is used it should + call VIDIOCSYNC to free this frame up and continue." + + The only odd thing about this whole procedure is + that MCAPTURE flags the buffer as "in use", and + SYNC immediately unmarks it, while it isn't + after SYNC that you know that the buffer actually + got filled! So you better not start a CAPTURE in + the same frame immediately (use double buffering). + This is not a problem for this cam, since it has + extra intermediate buffers, but a hardware + grabber card will then overwrite the buffer + you're working on. + */ + int *mbuf = arg; + int ret; + + Trace(TRACE_READ, "VIDIOCSYNC called (%d).\n", *mbuf); + + /* bounds check */ + if (*mbuf < 0 || *mbuf >= default_mbufs) + return -EINVAL; + /* check if this buffer was requested anyway */ + if (pdev->image_used[*mbuf] == 0) + return -EINVAL; + + /* Add ourselves to the frame wait-queue. + + FIXME: needs auditing for safety. + QUESTION: In what respect? I think that using the + frameq is safe now. + */ + add_wait_queue(&pdev->frameq, &wait); + while (pdev->full_frames == NULL) { + if (pdev->error_status) { + remove_wait_queue(&pdev->frameq, &wait); + set_current_state(TASK_RUNNING); + return -pdev->error_status; + } + + if (signal_pending(current)) { + remove_wait_queue(&pdev->frameq, &wait); + set_current_state(TASK_RUNNING); + return -ERESTARTSYS; + } + schedule(); + set_current_state(TASK_INTERRUPTIBLE); + } + remove_wait_queue(&pdev->frameq, &wait); + set_current_state(TASK_RUNNING); + + /* The frame is ready. Expand in the image buffer + requested by the user. I don't care if you + mmap() 5 buffers and request data in this order: + buffer 4 2 3 0 1 2 3 0 4 3 1 . . . + Grabber hardware may not be so forgiving. + */ + Trace(TRACE_READ, "VIDIOCSYNC: frame ready.\n"); + pdev->fill_image = *mbuf; /* tell in which buffer we want the image to be expanded */ + /* Decompress, etc */ + ret = pwc_handle_frame(pdev); + pdev->image_used[*mbuf] = 0; + if (ret) + return -EFAULT; + break; + } + + case VIDIOCGAUDIO: + { + struct video_audio *v = arg; + + strcpy(v->name, "Microphone"); + v->audio = -1; /* unknown audio minor */ + v->flags = 0; + v->mode = VIDEO_SOUND_MONO; + v->volume = 0; + v->bass = 0; + v->treble = 0; + v->balance = 0x8000; + v->step = 1; + break; + } + + case VIDIOCSAUDIO: + { + /* Dummy: nothing can be set */ + break; + } + + case VIDIOCGUNIT: + { + struct video_unit *vu = arg; + + vu->video = pdev->vdev->minor & 0x3F; + vu->audio = -1; /* not known yet */ + vu->vbi = -1; + vu->radio = -1; + vu->teletext = -1; + break; + } + default: + return pwc_ioctl(pdev, cmd, arg); + } /* ..switch */ + return 0; +} + +static int pwc_video_ioctl(struct inode *inode, struct file *file, + unsigned int cmd, unsigned long arg) +{ + return video_usercopy(inode, file, cmd, arg, pwc_video_do_ioctl); +} + + +static int pwc_video_mmap(struct file *file, struct vm_area_struct *vma) +{ + struct video_device *vdev = file->private_data; + struct pwc_device *pdev; + unsigned long start = vma->vm_start; + unsigned long size = vma->vm_end-vma->vm_start; + unsigned long page, pos; + + Trace(TRACE_MEMORY, "mmap(0x%p, 0x%lx, %lu) called.\n", vdev, start, size); + pdev = vdev->priv; + + vma->vm_flags |= VM_IO; + + pos = (unsigned long)pdev->image_data; + while (size > 0) { + page = vmalloc_to_pfn((void *)pos); + if (remap_pfn_range(vma, start, page, PAGE_SIZE, PAGE_SHARED)) + return -EAGAIN; + + start += PAGE_SIZE; + pos += PAGE_SIZE; + if (size > PAGE_SIZE) + size -= PAGE_SIZE; + else + size = 0; + } + + return 0; +} + +/***************************************************************************/ +/* USB functions */ + +/* This function gets called when a new device is plugged in or the usb core + * is loaded. + */ + +static int usb_pwc_probe(struct usb_interface *intf, const struct usb_device_id *id) +{ + struct usb_device *udev = interface_to_usbdev(intf); + struct pwc_device *pdev = NULL; + int vendor_id, product_id, type_id; + int i, hint; + int features = 0; + int video_nr = -1; /* default: use next available device */ + char serial_number[30], *name; + + /* Check if we can handle this device */ + Trace(TRACE_PROBE, "probe() called [%04X %04X], if %d\n", + le16_to_cpu(udev->descriptor.idVendor), + le16_to_cpu(udev->descriptor.idProduct), + intf->altsetting->desc.bInterfaceNumber); + + /* the interfaces are probed one by one. We are only interested in the + video interface (0) now. + Interface 1 is the Audio Control, and interface 2 Audio itself. + */ + if (intf->altsetting->desc.bInterfaceNumber > 0) + return -ENODEV; + + vendor_id = le16_to_cpu(udev->descriptor.idVendor); + product_id = le16_to_cpu(udev->descriptor.idProduct); + + if (vendor_id == 0x0471) { + switch (product_id) { + case 0x0302: + Info("Philips PCA645VC USB webcam detected.\n"); + name = "Philips 645 webcam"; + type_id = 645; + break; + case 0x0303: + Info("Philips PCA646VC USB webcam detected.\n"); + name = "Philips 646 webcam"; + type_id = 646; + break; + case 0x0304: + Info("Askey VC010 type 2 USB webcam detected.\n"); + name = "Askey VC010 webcam"; + type_id = 646; + break; + case 0x0307: + Info("Philips PCVC675K (Vesta) USB webcam detected.\n"); + name = "Philips 675 webcam"; + type_id = 675; + break; + case 0x0308: + Info("Philips PCVC680K (Vesta Pro) USB webcam detected.\n"); + name = "Philips 680 webcam"; + type_id = 680; + break; + case 0x030C: + Info("Philips PCVC690K (Vesta Pro Scan) USB webcam detected.\n"); + name = "Philips 690 webcam"; + type_id = 690; + break; + case 0x0310: + Info("Philips PCVC730K (ToUCam Fun)/PCVC830 (ToUCam II) USB webcam detected.\n"); + name = "Philips 730 webcam"; + type_id = 730; + break; + case 0x0311: + Info("Philips PCVC740K (ToUCam Pro)/PCVC840 (ToUCam II) USB webcam detected.\n"); + name = "Philips 740 webcam"; + type_id = 740; + break; + case 0x0312: + Info("Philips PCVC750K (ToUCam Pro Scan) USB webcam detected.\n"); + name = "Philips 750 webcam"; + type_id = 750; + break; + case 0x0313: + Info("Philips PCVC720K/40 (ToUCam XS) USB webcam detected.\n"); + name = "Philips 720K/40 webcam"; + type_id = 720; + break; + default: + return -ENODEV; + break; + } + } + else if (vendor_id == 0x069A) { + switch(product_id) { + case 0x0001: + Info("Askey VC010 type 1 USB webcam detected.\n"); + name = "Askey VC010 webcam"; + type_id = 645; + break; + default: + return -ENODEV; + break; + } + } + else if (vendor_id == 0x046d) { + switch(product_id) { + case 0x08b0: + Info("Logitech QuickCam Pro 3000 USB webcam detected.\n"); + name = "Logitech QuickCam Pro 3000"; + type_id = 740; /* CCD sensor */ + break; + case 0x08b1: + Info("Logitech QuickCam Notebook Pro USB webcam detected.\n"); + name = "Logitech QuickCam Notebook Pro"; + type_id = 740; /* CCD sensor */ + break; + case 0x08b2: + Info("Logitech QuickCam 4000 Pro USB webcam detected.\n"); + name = "Logitech QuickCam Pro 4000"; + type_id = 740; /* CCD sensor */ + break; + case 0x08b3: + Info("Logitech QuickCam Zoom USB webcam detected.\n"); + name = "Logitech QuickCam Zoom"; + type_id = 740; /* CCD sensor */ + break; + case 0x08B4: + Info("Logitech QuickCam Zoom (new model) USB webcam detected.\n"); + name = "Logitech QuickCam Zoom"; + type_id = 740; /* CCD sensor */ + break; + case 0x08b5: + Info("Logitech QuickCam Orbit/Sphere USB webcam detected.\n"); + name = "Logitech QuickCam Orbit"; + type_id = 740; /* CCD sensor */ + features |= FEATURE_MOTOR_PANTILT; + break; + case 0x08b6: + case 0x08b7: + case 0x08b8: + Info("Logitech QuickCam detected (reserved ID).\n"); + name = "Logitech QuickCam (res.)"; + type_id = 730; /* Assuming CMOS */ + break; + default: + return -ENODEV; + break; + } + } + else if (vendor_id == 0x055d) { + /* I don't know the difference between the C10 and the C30; + I suppose the difference is the sensor, but both cameras + work equally well with a type_id of 675 + */ + switch(product_id) { + case 0x9000: + Info("Samsung MPC-C10 USB webcam detected.\n"); + name = "Samsung MPC-C10"; + type_id = 675; + break; + case 0x9001: + Info("Samsung MPC-C30 USB webcam detected.\n"); + name = "Samsung MPC-C30"; + type_id = 675; + break; + default: + return -ENODEV; + break; + } + } + else if (vendor_id == 0x041e) { + switch(product_id) { + case 0x400c: + Info("Creative Labs Webcam 5 detected.\n"); + name = "Creative Labs Webcam 5"; + type_id = 730; + break; + case 0x4011: + Info("Creative Labs Webcam Pro Ex detected.\n"); + name = "Creative Labs Webcam Pro Ex"; + type_id = 740; + break; + default: + return -ENODEV; + break; + } + } + else if (vendor_id == 0x04cc) { + switch(product_id) { + case 0x8116: + Info("Sotec Afina Eye USB webcam detected.\n"); + name = "Sotec Afina Eye"; + type_id = 730; + break; + default: + return -ENODEV; + break; + } + } + else if (vendor_id == 0x06be) { + switch(product_id) { + case 0x8116: + /* This is essentially the same cam as the Sotec Afina Eye */ + Info("AME Co. Afina Eye USB webcam detected.\n"); + name = "AME Co. Afina Eye"; + type_id = 750; + break; + default: + return -ENODEV; + break; + } + + } + else if (vendor_id == 0x0d81) { + switch(product_id) { + case 0x1900: + Info("Visionite VCS-UC300 USB webcam detected.\n"); + name = "Visionite VCS-UC300"; + type_id = 740; /* CCD sensor */ + break; + case 0x1910: + Info("Visionite VCS-UM100 USB webcam detected.\n"); + name = "Visionite VCS-UM100"; + type_id = 730; /* CMOS sensor */ + break; + default: + return -ENODEV; + break; + } + } + else + return -ENODEV; /* Not any of the know types; but the list keeps growing. */ + + memset(serial_number, 0, 30); + usb_string(udev, udev->descriptor.iSerialNumber, serial_number, 29); + Trace(TRACE_PROBE, "Device serial number is %s\n", serial_number); + + if (udev->descriptor.bNumConfigurations > 1) + Info("Warning: more than 1 configuration available.\n"); + + /* Allocate structure, initialize pointers, mutexes, etc. and link it to the usb_device */ + pdev = kzalloc(sizeof(struct pwc_device), GFP_KERNEL); + if (pdev == NULL) { + Err("Oops, could not allocate memory for pwc_device.\n"); + return -ENOMEM; + } + pdev->type = type_id; + pdev->vsize = default_size; + pdev->vframes = default_fps; + strcpy(pdev->serial, serial_number); + pdev->features = features; + if (vendor_id == 0x046D && product_id == 0x08B5) + { + /* Logitech QuickCam Orbit + The ranges have been determined experimentally; they may differ from cam to cam. + Also, the exact ranges left-right and up-down are different for my cam + */ + pdev->angle_range.pan_min = -7000; + pdev->angle_range.pan_max = 7000; + pdev->angle_range.tilt_min = -3000; + pdev->angle_range.tilt_max = 2500; + } + + init_MUTEX(&pdev->modlock); + spin_lock_init(&pdev->ptrlock); + + pdev->udev = udev; + init_waitqueue_head(&pdev->frameq); + pdev->vcompression = pwc_preferred_compression; + + /* Allocate video_device structure */ + pdev->vdev = video_device_alloc(); + if (pdev->vdev == 0) + { + Err("Err, cannot allocate video_device struture. Failing probe."); + kfree(pdev); + return -ENOMEM; + } + memcpy(pdev->vdev, &pwc_template, sizeof(pwc_template)); + strcpy(pdev->vdev->name, name); + pdev->vdev->owner = THIS_MODULE; + video_set_drvdata(pdev->vdev, pdev); + + pdev->release = le16_to_cpu(udev->descriptor.bcdDevice); + Trace(TRACE_PROBE, "Release: %04x\n", pdev->release); + + /* Now search device_hint[] table for a match, so we can hint a node number. */ + for (hint = 0; hint < MAX_DEV_HINTS; hint++) { + if (((device_hint[hint].type == -1) || (device_hint[hint].type == pdev->type)) && + (device_hint[hint].pdev == NULL)) { + /* so far, so good... try serial number */ + if ((device_hint[hint].serial_number[0] == '*') || !strcmp(device_hint[hint].serial_number, serial_number)) { + /* match! */ + video_nr = device_hint[hint].device_node; + Trace(TRACE_PROBE, "Found hint, will try to register as /dev/video%d\n", video_nr); + break; + } + } + } + + pdev->vdev->release = video_device_release; + i = video_register_device(pdev->vdev, VFL_TYPE_GRABBER, video_nr); + if (i < 0) { + Err("Failed to register as video device (%d).\n", i); + video_device_release(pdev->vdev); /* Drip... drip... drip... */ + kfree(pdev); /* Oops, no memory leaks please */ + return -EIO; + } + else { + Info("Registered as /dev/video%d.\n", pdev->vdev->minor & 0x3F); + } + + /* occupy slot */ + if (hint < MAX_DEV_HINTS) + device_hint[hint].pdev = pdev; + + Trace(TRACE_PROBE, "probe() function returning struct at 0x%p.\n", pdev); + usb_set_intfdata (intf, pdev); + return 0; +} + +/* The user janked out the cable... */ +static void usb_pwc_disconnect(struct usb_interface *intf) +{ + struct pwc_device *pdev; + int hint; + + lock_kernel(); + pdev = usb_get_intfdata (intf); + usb_set_intfdata (intf, NULL); + if (pdev == NULL) { + Err("pwc_disconnect() Called without private pointer.\n"); + goto disconnect_out; + } + if (pdev->udev == NULL) { + Err("pwc_disconnect() already called for %p\n", pdev); + goto disconnect_out; + } + if (pdev->udev != interface_to_usbdev(intf)) { + Err("pwc_disconnect() Woops: pointer mismatch udev/pdev.\n"); + goto disconnect_out; + } +#ifdef PWC_MAGIC + if (pdev->magic != PWC_MAGIC) { + Err("pwc_disconnect() Magic number failed. Consult your scrolls and try again.\n"); + goto disconnect_out; + } +#endif + + /* We got unplugged; this is signalled by an EPIPE error code */ + if (pdev->vopen) { + Info("Disconnected while webcam is in use!\n"); + pdev->error_status = EPIPE; + } + + /* Alert waiting processes */ + wake_up_interruptible(&pdev->frameq); + /* Wait until device is closed */ + while (pdev->vopen) + schedule(); + /* Device is now closed, so we can safely unregister it */ + Trace(TRACE_PROBE, "Unregistering video device in disconnect().\n"); + video_unregister_device(pdev->vdev); + + /* Free memory (don't set pdev to 0 just yet) */ + kfree(pdev); + +disconnect_out: + /* search device_hint[] table if we occupy a slot, by any chance */ + for (hint = 0; hint < MAX_DEV_HINTS; hint++) + if (device_hint[hint].pdev == pdev) + device_hint[hint].pdev = NULL; + + unlock_kernel(); +} + + +/* *grunt* We have to do atoi ourselves :-( */ +static int pwc_atoi(const char *s) +{ + int k = 0; + + k = 0; + while (*s != '\0' && *s >= '0' && *s <= '9') { + k = 10 * k + (*s - '0'); + s++; + } + return k; +} + + +/* + * Initialization code & module stuff + */ + +static char size[10]; +static int fps = 0; +static int fbufs = 0; +static int mbufs = 0; +static int trace = -1; +static int compression = -1; +static int leds[2] = { -1, -1 }; +static char *dev_hint[MAX_DEV_HINTS] = { }; + +module_param_string(size, size, sizeof(size), 0); +MODULE_PARM_DESC(size, "Initial image size. One of sqcif, qsif, qcif, sif, cif, vga"); +module_param(fps, int, 0000); +MODULE_PARM_DESC(fps, "Initial frames per second. Varies with model, useful range 5-30"); +module_param(fbufs, int, 0000); +MODULE_PARM_DESC(fbufs, "Number of internal frame buffers to reserve"); +module_param(mbufs, int, 0000); +MODULE_PARM_DESC(mbufs, "Number of external (mmap()ed) image buffers"); +module_param(trace, int, 0000); +MODULE_PARM_DESC(trace, "For debugging purposes"); +module_param(power_save, bool, 0000); +MODULE_PARM_DESC(power_save, "Turn power save feature in camera on or off"); +module_param(compression, int, 0000); +MODULE_PARM_DESC(compression, "Preferred compression quality. Range 0 (uncompressed) to 3 (high compression)"); +module_param_array(leds, int, NULL, 0000); +MODULE_PARM_DESC(leds, "LED on,off time in milliseconds"); +module_param_array(dev_hint, charp, NULL, 0000); +MODULE_PARM_DESC(dev_hint, "Device node hints"); + +MODULE_DESCRIPTION("Philips & OEM USB webcam driver"); +MODULE_AUTHOR("Luc Saillard <luc@saillard.org>"); +MODULE_LICENSE("GPL"); + +static int __init usb_pwc_init(void) +{ + int i, sz; + char *sizenames[PSZ_MAX] = { "sqcif", "qsif", "qcif", "sif", "cif", "vga" }; + + Info("Philips webcam module version " PWC_VERSION " loaded.\n"); + Info("Supports Philips PCA645/646, PCVC675/680/690, PCVC720[40]/730/740/750 & PCVC830/840.\n"); + Info("Also supports the Askey VC010, various Logitech Quickcams, Samsung MPC-C10 and MPC-C30,\n"); + Info("the Creative WebCam 5 & Pro Ex, SOTEC Afina Eye and Visionite VCS-UC300 and VCS-UM100.\n"); + + if (fps) { + if (fps < 4 || fps > 30) { + Err("Framerate out of bounds (4-30).\n"); + return -EINVAL; + } + default_fps = fps; + Info("Default framerate set to %d.\n", default_fps); + } + + if (size[0]) { + /* string; try matching with array */ + for (sz = 0; sz < PSZ_MAX; sz++) { + if (!strcmp(sizenames[sz], size)) { /* Found! */ + default_size = sz; + break; + } + } + if (sz == PSZ_MAX) { + Err("Size not recognized; try size=[sqcif | qsif | qcif | sif | cif | vga].\n"); + return -EINVAL; + } + Info("Default image size set to %s [%dx%d].\n", sizenames[default_size], pwc_image_sizes[default_size].x, pwc_image_sizes[default_size].y); + } + if (mbufs) { + if (mbufs < 1 || mbufs > MAX_IMAGES) { + Err("Illegal number of mmap() buffers; use a number between 1 and %d.\n", MAX_IMAGES); + return -EINVAL; + } + default_mbufs = mbufs; + Info("Number of image buffers set to %d.\n", default_mbufs); + } + if (fbufs) { + if (fbufs < 2 || fbufs > MAX_FRAMES) { + Err("Illegal number of frame buffers; use a number between 2 and %d.\n", MAX_FRAMES); + return -EINVAL; + } + default_fbufs = fbufs; + Info("Number of frame buffers set to %d.\n", default_fbufs); + } + if (trace >= 0) { + Info("Trace options: 0x%04x\n", trace); + pwc_trace = trace; + } + if (compression >= 0) { + if (compression > 3) { + Err("Invalid compression setting; use a number between 0 (uncompressed) and 3 (high).\n"); + return -EINVAL; + } + pwc_preferred_compression = compression; + Info("Preferred compression set to %d.\n", pwc_preferred_compression); + } + if (power_save) + Info("Enabling power save on open/close.\n"); + if (leds[0] >= 0) + led_on = leds[0]; + if (leds[1] >= 0) + led_off = leds[1]; + + /* Big device node whoopla. Basically, it allows you to assign a + device node (/dev/videoX) to a camera, based on its type + & serial number. The format is [type[.serialnumber]:]node. + + Any camera that isn't matched by these rules gets the next + available free device node. + */ + for (i = 0; i < MAX_DEV_HINTS; i++) { + char *s, *colon, *dot; + + /* This loop also initializes the array */ + device_hint[i].pdev = NULL; + s = dev_hint[i]; + if (s != NULL && *s != '\0') { + device_hint[i].type = -1; /* wildcard */ + strcpy(device_hint[i].serial_number, "*"); + + /* parse string: chop at ':' & '/' */ + colon = dot = s; + while (*colon != '\0' && *colon != ':') + colon++; + while (*dot != '\0' && *dot != '.') + dot++; + /* Few sanity checks */ + if (*dot != '\0' && dot > colon) { + Err("Malformed camera hint: the colon must be after the dot.\n"); + return -EINVAL; + } + + if (*colon == '\0') { + /* No colon */ + if (*dot != '\0') { + Err("Malformed camera hint: no colon + device node given.\n"); + return -EINVAL; + } + else { + /* No type or serial number specified, just a number. */ + device_hint[i].device_node = pwc_atoi(s); + } + } + else { + /* There's a colon, so we have at least a type and a device node */ + device_hint[i].type = pwc_atoi(s); + device_hint[i].device_node = pwc_atoi(colon + 1); + if (*dot != '\0') { + /* There's a serial number as well */ + int k; + + dot++; + k = 0; + while (*dot != ':' && k < 29) { + device_hint[i].serial_number[k++] = *dot; + dot++; + } + device_hint[i].serial_number[k] = '\0'; + } + } +#if PWC_DEBUG + Debug("device_hint[%d]:\n", i); + Debug(" type : %d\n", device_hint[i].type); + Debug(" serial# : %s\n", device_hint[i].serial_number); + Debug(" node : %d\n", device_hint[i].device_node); +#endif + } + else + device_hint[i].type = 0; /* not filled */ + } /* ..for MAX_DEV_HINTS */ + + Trace(TRACE_PROBE, "Registering driver at address 0x%p.\n", &pwc_driver); + return usb_register(&pwc_driver); +} + +static void __exit usb_pwc_exit(void) +{ + Trace(TRACE_MODULE, "Deregistering driver.\n"); + usb_deregister(&pwc_driver); + Info("Philips webcam module removed.\n"); +} + +module_init(usb_pwc_init); +module_exit(usb_pwc_exit); + |