gspca.c 59.9 KB
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/*
 * Main USB camera driver
 *
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 * Copyright (C) 2008-2010 Jean-François Moine <http://moinejf.free.fr>
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 *
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 * Camera button input handling by Márton Németh
 * Copyright (C) 2009-2010 Márton Németh <nm127@freemail.hu>
 *
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 * 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>
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#include <linux/version.h>
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#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>
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#include <linux/io.h>
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#include <asm/page.h>
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#include <linux/uaccess.h>
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#include <linux/ktime.h>
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#include <media/v4l2-ioctl.h>
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#include "gspca.h"

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#if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
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#include <linux/input.h>
#include <linux/usb/input.h>
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#endif
47

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/* global values */
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#define DEF_NURBS 3		/* default number of URBs */
#if DEF_NURBS > MAX_NURBS
#error "DEF_NURBS too big"
#endif
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MODULE_AUTHOR("Jean-François Moine <http://moinejf.free.fr>");
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MODULE_DESCRIPTION("GSPCA USB Camera Driver");
MODULE_LICENSE("GPL");

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#define DRIVER_VERSION_NUMBER	KERNEL_VERSION(2, 11, 0)
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#ifdef GSPCA_DEBUG
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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

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/* specific memory types - !! should be different from V4L2_MEMORY_xxx */
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#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)

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/*
 * 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;
}

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static const struct vm_operations_struct gspca_vm_ops = {
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	.open		= gspca_vm_open,
	.close		= gspca_vm_close,
};

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/*
 * Input and interrupt endpoint handling functions
 */
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#if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
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static void int_irq(struct urb *urb)
{
	struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
	int ret;

	ret = urb->status;
	switch (ret) {
	case 0:
		if (gspca_dev->sd_desc->int_pkt_scan(gspca_dev,
		    urb->transfer_buffer, urb->actual_length) < 0) {
			PDEBUG(D_ERR, "Unknown packet received");
		}
		break;

	case -ENOENT:
	case -ECONNRESET:
	case -ENODEV:
	case -ESHUTDOWN:
		/* Stop is requested either by software or hardware is gone,
		 * keep the ret value non-zero and don't resubmit later.
		 */
		break;

	default:
		PDEBUG(D_ERR, "URB error %i, resubmitting", urb->status);
		urb->status = 0;
		ret = 0;
	}

	if (ret == 0) {
		ret = usb_submit_urb(urb, GFP_ATOMIC);
		if (ret < 0)
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			err("Resubmit URB failed with error %i", ret);
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	}
}

static int gspca_input_connect(struct gspca_dev *dev)
{
	struct input_dev *input_dev;
	int err = 0;

	dev->input_dev = NULL;
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	if (dev->sd_desc->int_pkt_scan || dev->sd_desc->other_input)  {
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		input_dev = input_allocate_device();
		if (!input_dev)
			return -ENOMEM;

		usb_make_path(dev->dev, dev->phys, sizeof(dev->phys));
		strlcat(dev->phys, "/input0", sizeof(dev->phys));

		input_dev->name = dev->sd_desc->name;
		input_dev->phys = dev->phys;

		usb_to_input_id(dev->dev, &input_dev->id);

		input_dev->evbit[0] = BIT_MASK(EV_KEY);
		input_dev->keybit[BIT_WORD(KEY_CAMERA)] = BIT_MASK(KEY_CAMERA);
		input_dev->dev.parent = &dev->dev->dev;

		err = input_register_device(input_dev);
		if (err) {
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			err("Input device registration failed with error %i",
				err);
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			input_dev->dev.parent = NULL;
			input_free_device(input_dev);
		} else {
			dev->input_dev = input_dev;
		}
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	}
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	return err;
}

static int alloc_and_submit_int_urb(struct gspca_dev *gspca_dev,
			  struct usb_endpoint_descriptor *ep)
{
	unsigned int buffer_len;
	int interval;
	struct urb *urb;
	struct usb_device *dev;
	void *buffer = NULL;
	int ret = -EINVAL;

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	buffer_len = le16_to_cpu(ep->wMaxPacketSize);
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	interval = ep->bInterval;
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	PDEBUG(D_CONF, "found int in endpoint: 0x%x, "
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		"buffer_len=%u, interval=%u",
		ep->bEndpointAddress, buffer_len, interval);

	dev = gspca_dev->dev;

	urb = usb_alloc_urb(0, GFP_KERNEL);
	if (!urb) {
		ret = -ENOMEM;
		goto error;
	}

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	buffer = usb_alloc_coherent(dev, buffer_len,
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				GFP_KERNEL, &urb->transfer_dma);
	if (!buffer) {
		ret = -ENOMEM;
		goto error_buffer;
	}
	usb_fill_int_urb(urb, dev,
		usb_rcvintpipe(dev, ep->bEndpointAddress),
		buffer, buffer_len,
		int_irq, (void *)gspca_dev, interval);
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	urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
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	ret = usb_submit_urb(urb, GFP_KERNEL);
	if (ret < 0) {
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		PDEBUG(D_ERR, "submit int URB failed with error %i", ret);
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		goto error_submit;
	}
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	gspca_dev->int_urb = urb;
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	return ret;

error_submit:
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	usb_free_coherent(dev,
			  urb->transfer_buffer_length,
			  urb->transfer_buffer,
			  urb->transfer_dma);
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error_buffer:
	usb_free_urb(urb);
error:
	return ret;
}

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static void gspca_input_create_urb(struct gspca_dev *gspca_dev)
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{
	struct usb_interface *intf;
	struct usb_host_interface *intf_desc;
	struct usb_endpoint_descriptor *ep;
	int i;

	if (gspca_dev->sd_desc->int_pkt_scan)  {
		intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
		intf_desc = intf->cur_altsetting;
		for (i = 0; i < intf_desc->desc.bNumEndpoints; i++) {
			ep = &intf_desc->endpoint[i].desc;
			if (usb_endpoint_dir_in(ep) &&
			    usb_endpoint_xfer_int(ep)) {

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				alloc_and_submit_int_urb(gspca_dev, ep);
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				break;
			}
		}
	}
}

static void gspca_input_destroy_urb(struct gspca_dev *gspca_dev)
{
	struct urb *urb;

	urb = gspca_dev->int_urb;
	if (urb) {
		gspca_dev->int_urb = NULL;
		usb_kill_urb(urb);
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		usb_free_coherent(gspca_dev->dev,
				  urb->transfer_buffer_length,
				  urb->transfer_buffer,
				  urb->transfer_dma);
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		usb_free_urb(urb);
	}
}
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#else
static inline void gspca_input_destroy_urb(struct gspca_dev *gspca_dev)
{
}

static inline void gspca_input_create_urb(struct gspca_dev *gspca_dev)
{
}

static inline int gspca_input_connect(struct gspca_dev *dev)
{
	return 0;
}
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#endif

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/*
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 * fill a video frame from an URB and resubmit
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 */
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static void fill_frame(struct gspca_dev *gspca_dev,
			struct urb *urb)
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{
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	u8 *data;		/* address of data in the iso message */
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	int i, len, st;
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	cam_pkt_op pkt_scan;

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	if (urb->status != 0) {
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		if (urb->status == -ESHUTDOWN)
			return;		/* disconnection */
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#ifdef CONFIG_PM
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		if (gspca_dev->frozen)
			return;
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#endif
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		PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
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		urb->status = 0;
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		goto resubmit;
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	}
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	pkt_scan = gspca_dev->sd_desc->pkt_scan;
	for (i = 0; i < urb->number_of_packets; i++) {
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		len = urb->iso_frame_desc[i].actual_length;
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		/* check the packet status and length */
		st = urb->iso_frame_desc[i].status;
		if (st) {
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			err("ISOC data error: [%d] len=%d, status=%d",
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				i, len, st);
			gspca_dev->last_packet_type = DISCARD_PACKET;
			continue;
		}
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		if (len == 0) {
			if (gspca_dev->empty_packet == 0)
				gspca_dev->empty_packet = 1;
			continue;
		}
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		/* 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);
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		data = (u8 *) urb->transfer_buffer
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					+ urb->iso_frame_desc[i].offset;
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		pkt_scan(gspca_dev, data, len);
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	}

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resubmit:
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	/* resubmit the URB */
	st = usb_submit_urb(urb, GFP_ATOMIC);
	if (st < 0)
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		err("usb_submit_urb() ret %d", st);
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}

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/*
 * ISOC message interrupt from the USB device
 *
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 * Analyse each packet and call the subdriver for copy to the frame buffer.
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 */
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static void isoc_irq(struct urb *urb)
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{
	struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;

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	PDEBUG(D_PACK, "isoc irq");
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	if (!gspca_dev->streaming)
		return;
	fill_frame(gspca_dev, urb);
}

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/*
 * bulk message interrupt from the USB device
 */
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static void bulk_irq(struct urb *urb)
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{
	struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
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	int st;
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	PDEBUG(D_PACK, "bulk irq");
	if (!gspca_dev->streaming)
		return;
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	switch (urb->status) {
	case 0:
		break;
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	case -ESHUTDOWN:
		return;		/* disconnection */
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	default:
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#ifdef CONFIG_PM
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		if (gspca_dev->frozen)
			return;
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#endif
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		PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
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		urb->status = 0;
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		goto resubmit;
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	}

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	PDEBUG(D_PACK, "packet l:%d", urb->actual_length);
	gspca_dev->sd_desc->pkt_scan(gspca_dev,
				urb->transfer_buffer,
				urb->actual_length);
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resubmit:
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	/* resubmit the URB */
	if (gspca_dev->cam.bulk_nurbs != 0) {
		st = usb_submit_urb(urb, GFP_ATOMIC);
		if (st < 0)
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			err("usb_submit_urb() ret %d", st);
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	}
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}

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/*
 * add data to the current frame
 *
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 * This function is called by the subdrivers at interrupt level.
 *
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 * 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.
 */
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void gspca_frame_add(struct gspca_dev *gspca_dev,
			enum gspca_packet_type packet_type,
			const u8 *data,
			int len)
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{
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	struct gspca_frame *frame;
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	int i, j;

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	PDEBUG(D_PACK, "add t:%d l:%d",	packet_type, len);
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	if (packet_type == FIRST_PACKET) {
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		i = atomic_read(&gspca_dev->fr_i);

		/* if there are no queued buffer, discard the whole frame */
		if (i == atomic_read(&gspca_dev->fr_q)) {
			gspca_dev->last_packet_type = DISCARD_PACKET;
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			gspca_dev->sequence++;
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			return;
		}
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		j = gspca_dev->fr_queue[i];
		frame = &gspca_dev->frame[j];
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		frame->v4l2_buf.timestamp = ktime_to_timeval(ktime_get());
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		frame->v4l2_buf.sequence = gspca_dev->sequence++;
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		gspca_dev->image = frame->data;
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		gspca_dev->image_len = 0;
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	} else {
		switch (gspca_dev->last_packet_type) {
		case DISCARD_PACKET:
			if (packet_type == LAST_PACKET)
				gspca_dev->last_packet_type = packet_type;
			return;
		case LAST_PACKET:
			return;
		}
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	}
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	/* append the packet to the frame buffer */
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	if (len > 0) {
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		if (gspca_dev->image_len + len > gspca_dev->frsz) {
			PDEBUG(D_ERR|D_PACK, "frame overflow %d > %d",
				gspca_dev->image_len + len,
				gspca_dev->frsz);
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			packet_type = DISCARD_PACKET;
		} else {
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/* !! image is NULL only when last pkt is LAST or DISCARD
			if (gspca_dev->image == NULL) {
				err("gspca_frame_add() image == NULL");
				return;
			}
 */
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			memcpy(gspca_dev->image + gspca_dev->image_len,
				data, len);
			gspca_dev->image_len += len;
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		}
	}
	gspca_dev->last_packet_type = packet_type;

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	/* if last packet, invalidate packet concatenation until
	 * next first packet, wake up the application and advance
	 * in the queue */
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	if (packet_type == LAST_PACKET) {
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		i = atomic_read(&gspca_dev->fr_i);
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		j = gspca_dev->fr_queue[i];
		frame = &gspca_dev->frame[j];
		frame->v4l2_buf.bytesused = gspca_dev->image_len;
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		frame->v4l2_buf.flags = (frame->v4l2_buf.flags
					 | V4L2_BUF_FLAG_DONE)
					& ~V4L2_BUF_FLAG_QUEUED;
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		i = (i + 1) % GSPCA_MAX_FRAMES;
		atomic_set(&gspca_dev->fr_i, i);
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		wake_up_interruptible(&gspca_dev->wq);	/* event = new frame */
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		PDEBUG(D_FRAM, "frame complete len:%d",
			frame->v4l2_buf.bytesused);
		gspca_dev->image = NULL;
		gspca_dev->image_len = 0;
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	}
}
EXPORT_SYMBOL(gspca_frame_add);

static int gspca_is_compressed(__u32 format)
{
	switch (format) {
	case V4L2_PIX_FMT_MJPEG:
	case V4L2_PIX_FMT_JPEG:
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	case V4L2_PIX_FMT_SPCA561:
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	case V4L2_PIX_FMT_PAC207:
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	case V4L2_PIX_FMT_MR97310A:
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		return 1;
	}
	return 0;
}

static int frame_alloc(struct gspca_dev *gspca_dev,
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			unsigned int count)
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{
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	struct gspca_frame *frame;
	unsigned int frsz;
	int i;
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	i = gspca_dev->curr_mode;
	frsz = gspca_dev->cam.cam_mode[i].sizeimage;
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	PDEBUG(D_STREAM, "frame alloc frsz: %d", frsz);
	frsz = PAGE_ALIGN(frsz);
	gspca_dev->frsz = frsz;
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	if (count >= GSPCA_MAX_FRAMES)
		count = GSPCA_MAX_FRAMES - 1;
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	gspca_dev->frbuf = vmalloc_32(frsz * count);
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	if (!gspca_dev->frbuf) {
		err("frame alloc failed");
		return -ENOMEM;
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	}
	gspca_dev->nframes = count;
	for (i = 0; i < count; i++) {
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		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;
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		frame->data = gspca_dev->frbuf + i * frsz;
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		frame->v4l2_buf.m.offset = i * frsz;
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	}
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	atomic_set(&gspca_dev->fr_q, 0);
	atomic_set(&gspca_dev->fr_i, 0);
	gspca_dev->fr_o = 0;
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	return 0;
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}

static void frame_free(struct gspca_dev *gspca_dev)
{
	int i;

	PDEBUG(D_STREAM, "frame free");
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	if (gspca_dev->frbuf != NULL) {
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		vfree(gspca_dev->frbuf);
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		gspca_dev->frbuf = NULL;
		for (i = 0; i < gspca_dev->nframes; i++)
			gspca_dev->frame[i].data = NULL;
	}
	gspca_dev->nframes = 0;
}

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static void destroy_urbs(struct gspca_dev *gspca_dev)
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{
	struct urb *urb;
	unsigned int i;

	PDEBUG(D_STREAM, "kill transfer");
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	for (i = 0; i < MAX_NURBS; i++) {
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		urb = gspca_dev->urb[i];
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		if (urb == NULL)
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			break;
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		gspca_dev->urb[i] = NULL;
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		usb_kill_urb(urb);
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		if (urb->transfer_buffer != NULL)
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			usb_free_coherent(gspca_dev->dev,
					  urb->transfer_buffer_length,
					  urb->transfer_buffer,
					  urb->transfer_dma);
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		usb_free_urb(urb);
	}
}

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static int gspca_set_alt0(struct gspca_dev *gspca_dev)
{
	int ret;

	if (gspca_dev->alt == 0)
		return 0;
	ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, 0);
	if (ret < 0)
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		err("set alt 0 err %d", ret);
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	return ret;
}

/* Note: both the queue and the usb locks should be held when calling this */
static void gspca_stream_off(struct gspca_dev *gspca_dev)
{
	gspca_dev->streaming = 0;
	if (gspca_dev->present) {
		if (gspca_dev->sd_desc->stopN)
			gspca_dev->sd_desc->stopN(gspca_dev);
		destroy_urbs(gspca_dev);
		gspca_input_destroy_urb(gspca_dev);
		gspca_set_alt0(gspca_dev);
		gspca_input_create_urb(gspca_dev);
	}

	/* always call stop0 to free the subdriver's resources */
	if (gspca_dev->sd_desc->stop0)
		gspca_dev->sd_desc->stop0(gspca_dev);
	PDEBUG(D_STREAM, "stream off OK");
}

616
/*
617
 * look for an input transfer endpoint in an alternate setting
618
 */
619
static struct usb_host_endpoint *alt_xfer(struct usb_host_interface *alt,
620
					  int xfer)
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{
	struct usb_host_endpoint *ep;
	int i, attr;

	for (i = 0; i < alt->desc.bNumEndpoints; i++) {
		ep = &alt->endpoint[i];
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		attr = ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
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		if (attr == xfer
		    && ep->desc.wMaxPacketSize != 0)
630
			return ep;
631 632 633 634 635
	}
	return NULL;
}

/*
636
 * look for an input (isoc or bulk) endpoint
637 638 639 640 641 642
 *
 * 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).
 */
643
static struct usb_host_endpoint *get_ep(struct gspca_dev *gspca_dev)
644 645 646
{
	struct usb_interface *intf;
	struct usb_host_endpoint *ep;
647
	int xfer, i, ret;
648 649

	intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
650
	ep = NULL;
651 652
	xfer = gspca_dev->cam.bulk ? USB_ENDPOINT_XFER_BULK
				   : USB_ENDPOINT_XFER_ISOC;
653
	i = gspca_dev->alt;			/* previous alt setting */
654 655 656 657 658 659 660 661 662 663 664 665
	if (gspca_dev->cam.reverse_alts) {
		while (++i < gspca_dev->nbalt) {
			ep = alt_xfer(&intf->altsetting[i], xfer);
			if (ep)
				break;
		}
	} else {
		while (--i >= 0) {
			ep = alt_xfer(&intf->altsetting[i], xfer);
			if (ep)
				break;
		}
666
	}
667
	if (ep == NULL) {
668 669
		err("no transfer endpoint found");
		return NULL;
670
	}
671
	PDEBUG(D_STREAM, "use alt %d ep 0x%02x",
672
			i, ep->desc.bEndpointAddress);
673
	gspca_dev->alt = i;		/* memorize the current alt setting */
674
	if (gspca_dev->nbalt > 1) {
675 676
		ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, i);
		if (ret < 0) {
677
			err("set alt %d err %d", i, ret);
678
			ep = NULL;
679
		}
680 681 682 683 684
	}
	return ep;
}

/*
685
 * create the URBs for image transfer
686 687 688 689 690
 */
static int create_urbs(struct gspca_dev *gspca_dev,
			struct usb_host_endpoint *ep)
{
	struct urb *urb;
691
	int n, nurbs, i, psize, npkt, bsize;
692 693 694

	/* calculate the packet size and the number of packets */
	psize = le16_to_cpu(ep->desc.wMaxPacketSize);
695

696
	if (!gspca_dev->cam.bulk) {		/* isoc */
697 698

		/* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */
699 700 701 702
		if (gspca_dev->pkt_size == 0)
			psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
		else
			psize = gspca_dev->pkt_size;
703 704 705
		npkt = gspca_dev->cam.npkt;
		if (npkt == 0)
			npkt = 32;		/* default value */
706 707 708 709
		bsize = psize * npkt;
		PDEBUG(D_STREAM,
			"isoc %d pkts size %d = bsize:%d",
			npkt, psize, bsize);
710
		nurbs = DEF_NURBS;
711
	} else {				/* bulk */
712
		npkt = 0;
713
		bsize = gspca_dev->cam.bulk_size;
714 715
		if (bsize == 0)
			bsize = psize;
716
		PDEBUG(D_STREAM, "bulk bsize:%d", bsize);
717 718 719 720
		if (gspca_dev->cam.bulk_nurbs != 0)
			nurbs = gspca_dev->cam.bulk_nurbs;
		else
			nurbs = 1;
721 722
	}

723
	for (n = 0; n < nurbs; n++) {
724 725 726 727 728
		urb = usb_alloc_urb(npkt, GFP_KERNEL);
		if (!urb) {
			err("usb_alloc_urb failed");
			return -ENOMEM;
		}
729
		gspca_dev->urb[n] = urb;
730
		urb->transfer_buffer = usb_alloc_coherent(gspca_dev->dev,
731 732 733 734
						bsize,
						GFP_KERNEL,
						&urb->transfer_dma);

735
		if (urb->transfer_buffer == NULL) {
736
			err("usb_alloc_coherent failed");
737 738 739 740 741
			return -ENOMEM;
		}
		urb->dev = gspca_dev->dev;
		urb->context = gspca_dev;
		urb->transfer_buffer_length = bsize;
742 743 744
		if (npkt != 0) {		/* ISOC */
			urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
						    ep->desc.bEndpointAddress);
745 746
			urb->transfer_flags = URB_ISO_ASAP
					| URB_NO_TRANSFER_DMA_MAP;
747 748 749 750 751 752 753 754 755
			urb->interval = ep->desc.bInterval;
			urb->complete = isoc_irq;
			urb->number_of_packets = npkt;
			for (i = 0; i < npkt; i++) {
				urb->iso_frame_desc[i].length = psize;
				urb->iso_frame_desc[i].offset = psize * i;
			}
		} else {		/* bulk */
			urb->pipe = usb_rcvbulkpipe(gspca_dev->dev,
756
						ep->desc.bEndpointAddress);
757
			urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
758
			urb->complete = bulk_irq;
759 760 761 762 763 764 765 766 767 768 769
		}
	}
	return 0;
}

/*
 * start the USB transfer
 */
static int gspca_init_transfer(struct gspca_dev *gspca_dev)
{
	struct usb_host_endpoint *ep;
770
	struct urb *urb;
771 772
	int n, ret;

773 774
	if (mutex_lock_interruptible(&gspca_dev->usb_lock))
		return -ERESTARTSYS;
775

776 777
	if (!gspca_dev->present) {
		ret = -ENODEV;
778
		goto unlock;
779 780
	}

781 782 783 784 785 786
	/* reset the streaming variables */
	gspca_dev->image = NULL;
	gspca_dev->image_len = 0;
	gspca_dev->last_packet_type = DISCARD_PACKET;
	gspca_dev->sequence = 0;

787 788
	gspca_dev->usb_err = 0;

789 790
	/* set the higher alternate setting and
	 * loop until urb submit succeeds */
791 792 793 794 795
	if (gspca_dev->cam.reverse_alts)
		gspca_dev->alt = 0;
	else
		gspca_dev->alt = gspca_dev->nbalt;

796 797 798
	if (gspca_dev->sd_desc->isoc_init) {
		ret = gspca_dev->sd_desc->isoc_init(gspca_dev);
		if (ret < 0)
799
			goto unlock;
800
	}
801 802

	gspca_input_destroy_urb(gspca_dev);
803 804 805 806 807
	ep = get_ep(gspca_dev);
	if (ep == NULL) {
		ret = -EIO;
		goto out;
	}
808
	for (;;) {
809 810 811 812 813 814 815 816
		if (!gspca_dev->cam.no_urb_create) {
			PDEBUG(D_STREAM, "init transfer alt %d",
				gspca_dev->alt);
			ret = create_urbs(gspca_dev, ep);
			if (ret < 0) {
				destroy_urbs(gspca_dev);
				goto out;
			}
817
		}
818

819
		/* clear the bulk endpoint */
820
		if (gspca_dev->cam.bulk)
821
			usb_clear_halt(gspca_dev->dev,
822
					gspca_dev->urb[0]->pipe);
823

824
		/* start the cam */
825 826 827 828 829
		ret = gspca_dev->sd_desc->start(gspca_dev);
		if (ret < 0) {
			destroy_urbs(gspca_dev);
			goto out;
		}
830 831
		gspca_dev->streaming = 1;

832
		/* some bulk transfers are started by the subdriver */
833
		if (gspca_dev->cam.bulk && gspca_dev->cam.bulk_nurbs == 0)
834 835
			break;

836
		/* submit the URBs */
837 838 839 840 841
		for (n = 0; n < MAX_NURBS; n++) {
			urb = gspca_dev->urb[n];
			if (urb == NULL)
				break;
			ret = usb_submit_urb(urb, GFP_KERNEL);
842 843
			if (ret < 0)
				break;
844 845 846
		}
		if (ret >= 0)
			break;
847
		gspca_stream_off(gspca_dev);
848
		if (ret != -ENOSPC) {
849
			err("usb_submit_urb alt %d err %d",
850
				gspca_dev->alt, ret);
851
			goto out;
852
		}
853 854 855

		/* the bandwidth is not wide enough
		 * negociate or try a lower alternate setting */
856 857
		PDEBUG(D_ERR|D_STREAM,
			"bandwidth not wide enough - trying again");
858 859 860 861 862 863 864 865 866 867 868 869
		msleep(20);	/* wait for kill complete */
		if (gspca_dev->sd_desc->isoc_nego) {
			ret = gspca_dev->sd_desc->isoc_nego(gspca_dev);
			if (ret < 0)
				goto out;
		} else {
			ep = get_ep(gspca_dev);
			if (ep == NULL) {
				ret = -EIO;
				goto out;
			}
		}
870 871
	}
out:
872 873
	gspca_input_create_urb(gspca_dev);
unlock:
874 875 876 877
	mutex_unlock(&gspca_dev->usb_lock);
	return ret;
}

878
static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
879
{
880
	struct gspca_ctrl *ctrl;
881 882 883 884 885 886
	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;
887
	gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i].pixelformat;
888 889 890 891 892 893 894 895 896 897

	/* set the current control values to their default values
	 * which may have changed in sd_init() */
	ctrl = gspca_dev->cam.ctrls;
	if (ctrl != NULL) {
		for (i = 0;
		     i < gspca_dev->sd_desc->nctrls;
		     i++, ctrl++)
			ctrl->val = ctrl->def;
	}
898 899 900 901 902 903 904
}

static int wxh_to_mode(struct gspca_dev *gspca_dev,
			int width, int height)
{
	int i;

905 906 907
	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)
908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924
			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) {
925 926
			if (gspca_dev->cam.cam_mode[modeD].pixelformat
								== pixfmt)
927 928 929
				return modeD;
		}
		if (++modeU < gspca_dev->cam.nmodes) {
930 931
			if (gspca_dev->cam.cam_mode[modeU].pixelformat
								== pixfmt)
932 933 934 935 936 937
				return modeU;
		}
	}
	return -EINVAL;
}

938 939 940 941 942 943 944 945 946 947 948 949 950 951 952
#ifdef CONFIG_VIDEO_ADV_DEBUG
static int vidioc_g_register(struct file *file, void *priv,
			struct v4l2_dbg_register *reg)
{
	int ret;
	struct gspca_dev *gspca_dev = priv;

	if (!gspca_dev->sd_desc->get_chip_ident)
		return -EINVAL;

	if (!gspca_dev->sd_desc->get_register)
		return -EINVAL;

	if (mutex_lock_interruptible(&gspca_dev->usb_lock))
		return -ERESTARTSYS;
953
	gspca_dev->usb_err = 0;
954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976
	if (gspca_dev->present)
		ret = gspca_dev->sd_desc->get_register(gspca_dev, reg);
	else
		ret = -ENODEV;
	mutex_unlock(&gspca_dev->usb_lock);

	return ret;
}

static int vidioc_s_register(struct file *file, void *priv,
			struct v4l2_dbg_register *reg)
{
	int ret;
	struct gspca_dev *gspca_dev = priv;

	if (!gspca_dev->sd_desc->get_chip_ident)
		return -EINVAL;

	if (!gspca_dev->sd_desc->set_register)
		return -EINVAL;

	if (mutex_lock_interruptible(&gspca_dev->usb_lock))
		return -ERESTARTSYS;
977
	gspca_dev->usb_err = 0;
978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998
	if (gspca_dev->present)
		ret = gspca_dev->sd_desc->set_register(gspca_dev, reg);
	else
		ret = -ENODEV;
	mutex_unlock(&gspca_dev->usb_lock);

	return ret;
}
#endif

static int vidioc_g_chip_ident(struct file *file, void *priv,
			struct v4l2_dbg_chip_ident *chip)
{
	int ret;
	struct gspca_dev *gspca_dev = priv;

	if (!gspca_dev->sd_desc->get_chip_ident)
		return -EINVAL;

	if (mutex_lock_interruptible(&gspca_dev->usb_lock))
		return -ERESTARTSYS;
999
	gspca_dev->usb_err = 0;
1000 1001 1002 1003 1004 1005 1006 1007 1008
	if (gspca_dev->present)
		ret = gspca_dev->sd_desc->get_chip_ident(gspca_dev, chip);
	else
		ret = -ENODEV;
	mutex_unlock(&gspca_dev->usb_lock);

	return ret;
}

1009
static int vidioc_enum_fmt_vid_cap(struct file *file, void  *priv,
1010 1011 1012
				struct v4l2_fmtdesc *fmtdesc)
{
	struct gspca_dev *gspca_dev = priv;
1013
	int i, j, index;
1014 1015 1016 1017 1018 1019
	__u32 fmt_tb[8];

	/* give an index to each format */
	index = 0;
	j = 0;
	for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
1020
		fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
1021 1022 1023 1024 1025 1026 1027 1028 1029 1030
		j = 0;
		for (;;) {
			if (fmt_tb[j] == fmt_tb[index])
				break;
			j++;
		}
		if (j == index) {
			if (fmtdesc->index == index)
				break;		/* new format */
			index++;
1031
			if (index >= ARRAY_SIZE(fmt_tb))
1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048
				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->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;
}

1049
static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
1050 1051 1052
			    struct v4l2_format *fmt)
{
	struct gspca_dev *gspca_dev = priv;
1053
	int mode;
1054

1055 1056 1057
	mode = gspca_dev->curr_mode;
	memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
		sizeof fmt->fmt.pix);
1058 1059 1060
	return 0;
}

1061
static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
1062 1063
			struct v4l2_format *fmt)
{
1064
	int w, h, mode, mode2;
1065

1066 1067
	w = fmt->fmt.pix.width;
	h = fmt->fmt.pix.height;
1068

1069
#ifdef GSPCA_DEBUG
1070 1071 1072 1073 1074 1075 1076
	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 */
1077 1078
	if (gspca_dev->cam.cam_mode[mode].pixelformat
						!= fmt->fmt.pix.pixelformat) {
1079 1080 1081 1082

		/* else, search the closest mode with the same pixel format */
		mode2 = gspca_get_mode(gspca_dev, mode,
					fmt->fmt.pix.pixelformat);
1083
		if (mode2 >= 0)
1084
			mode = mode2;
1085 1086
/*		else
			;		 * no chance, return this mode */
1087
	}
1088 1089
	memcpy(&fmt->fmt.pix, &gspca_dev->cam.cam_mode[mode],
		sizeof fmt->fmt.pix);
1090 1091 1092
	return mode;			/* used when s_fmt */
}

1093
static int vidioc_try_fmt_vid_cap(struct file *file,
1094 1095 1096
			      void *priv,
			      struct v4l2_format *fmt)
{
1097
	struct gspca_dev *gspca_dev = priv;
1098 1099
	int ret;

1100
	ret = try_fmt_vid_cap(gspca_dev, fmt);
1101 1102 1103 1104 1105
	if (ret < 0)
		return ret;
	return 0;
}

1106
static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
1107 1108 1109
			    struct v4l2_format *fmt)
{
	struct gspca_dev *gspca_dev = priv;
1110
	int ret;
1111

1112 1113
	if (mutex_lock_interruptible(&gspca_dev->queue_lock))
		return -ERESTARTSYS;
1114

1115
	ret = try_fmt_vid_cap(gspca_dev, fmt);
1116 1117 1118
	if (ret < 0)
		goto out;

1119 1120 1121 1122 1123 1124
	if (gspca_dev->nframes != 0
	    && fmt->fmt.pix.sizeimage > gspca_dev->frsz) {
		ret = -EINVAL;
		goto out;
	}

1125 1126
	if (ret == gspca_dev->curr_mode) {
		ret = 0;
1127
		goto out;			/* same mode */
1128
	}
1129 1130 1131 1132

	if (gspca_dev->streaming) {
		ret = -EBUSY;
		goto out;
1133
	}
1134 1135
	gspca_dev->width = fmt->fmt.pix.width;
	gspca_dev->height = fmt->fmt.pix.height;
1136 1137
	gspca_dev->pixfmt = fmt->fmt.pix.pixelformat;
	gspca_dev->curr_mode = ret;
1138 1139

	ret = 0;
1140 1141 1142 1143 1144
out:
	mutex_unlock(&gspca_dev->queue_lock);
	return ret;
}

1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170
static int vidioc_enum_framesizes(struct file *file, void *priv,
				  struct v4l2_frmsizeenum *fsize)
{
	struct gspca_dev *gspca_dev = priv;
	int i;
	__u32 index = 0;

	for (i = 0; i < gspca_dev->cam.nmodes; i++) {
		if (fsize->pixel_format !=
				gspca_dev->cam.cam_mode[i].pixelformat)
			continue;

		if (fsize->index == index) {
			fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
			fsize->discrete.width =
				gspca_dev->cam.cam_mode[i].width;
			fsize->discrete.height =
				gspca_dev->cam.cam_mode[i].height;
			return 0;
		}
		index++;
	}

	return -EINVAL;
}

1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198
static int vidioc_enum_frameintervals(struct file *filp, void *priv,
				      struct v4l2_frmivalenum *fival)
{
	struct gspca_dev *gspca_dev = priv;
	int mode = wxh_to_mode(gspca_dev, fival->width, fival->height);
	__u32 i;

	if (gspca_dev->cam.mode_framerates == NULL ||
			gspca_dev->cam.mode_framerates[mode].nrates == 0)
		return -EINVAL;

	if (fival->pixel_format !=
			gspca_dev->cam.cam_mode[mode].pixelformat)
		return -EINVAL;

	for (i = 0; i < gspca_dev->cam.mode_framerates[mode].nrates; i++) {
		if (fival->index == i) {
			fival->type = V4L2_FRMSIZE_TYPE_DISCRETE;
			fival->discrete.numerator = 1;
			fival->discrete.denominator =
				gspca_dev->cam.mode_framerates[mode].rates[i];
			return 0;
		}
	}

	return -EINVAL;
}

1199
static void gspca_release(struct video_device *vfd)
1200
{
1201
	struct gspca_dev *gspca_dev = container_of(vfd, struct gspca_dev, vdev);
1202

1203 1204
	PDEBUG(D_PROBE, "%s released",
		video_device_node_name(&gspca_dev->vdev));
1205 1206 1207 1208 1209

	kfree(gspca_dev->usb_buf);
	kfree(gspca_dev);
}

1210
static int dev_open(struct file *file)
1211 1212 1213 1214
{
	struct gspca_dev *gspca_dev;
	int ret;

1215
	PDEBUG(D_STREAM, "[%s] open", current->comm);
1216
	gspca_dev = (struct gspca_dev *) video_devdata(file);
1217 1218
	if (mutex_lock_interruptible(&gspca_dev->queue_lock))
		return -ERESTARTSYS;
1219 1220 1221 1222 1223
	if (!gspca_dev->present) {
		ret = -ENODEV;
		goto out;
	}

1224
	if (gspca_dev->users > 4) {	/* (arbitrary value) */
1225 1226 1227
		ret = -EBUSY;
		goto out;
	}
1228 1229 1230 1231 1232 1233 1234

	/* protect the subdriver against rmmod */
	if (!try_module_get(gspca_dev->module)) {
		ret = -ENODEV;
		goto out;
	}

1235
	gspca_dev->users++;
1236

1237
	file->private_data = gspca_dev;
1238
#ifdef GSPCA_DEBUG
1239
	/* activate the v4l2 debug */
1240
	if (gspca_debug & D_V4L2)
1241
		gspca_dev->vdev.debug |= V4L2_DEBUG_IOCTL
1242
					| V4L2_DEBUG_IOCTL_ARG;
1243
	else
1244
		gspca_dev->vdev.debug &= ~(V4L2_DEBUG_IOCTL
1245
					| V4L2_DEBUG_IOCTL_ARG);
1246
#endif
1247
	ret = 0;
1248 1249 1250 1251 1252
out:
	mutex_unlock(&gspca_dev->queue_lock);
	if (ret != 0)
		PDEBUG(D_ERR|D_STREAM, "open failed err %d", ret);
	else
1253
		PDEBUG(D_STREAM, "open done");
1254 1255 1256
	return ret;
}

1257
static int dev_close(struct file *file)
1258 1259 1260
{
	struct gspca_dev *gspca_dev = file->private_data;

1261
	PDEBUG(D_STREAM, "[%s] close", current->comm);
1262 1263 1264 1265
	if (mutex_lock_interruptible(&gspca_dev->queue_lock))
		return -ERESTARTSYS;
	gspca_dev->users--;

1266
	/* if the file did the capture, free the streaming resources */
1267
	if (gspca_dev->capt_file == file) {
1268 1269
		if (gspca_dev->streaming) {
			mutex_lock(&gspca_dev->usb_lock);
1270
			gspca_dev->usb_err = 0;
1271 1272 1273
			gspca_stream_off(gspca_dev);
			mutex_unlock(&gspca_dev->usb_lock);
		}
1274
		frame_free(gspca_dev);
1275
		gspca_dev->capt_file = NULL;
1276
		gspca_dev->memory = GSPCA_MEMORY_NO;
1277
	}
1278
	file->private_data = NULL;
1279
	module_put(gspca_dev->module);
1280
	mutex_unlock(&gspca_dev->queue_lock);
1281

1282
	PDEBUG(D_STREAM, "close done");
1283

1284 1285 1286 1287 1288 1289 1290
	return 0;
}

static int vidioc_querycap(struct file *file, void  *priv,
			   struct v4l2_capability *cap)
{
	struct gspca_dev *gspca_dev = priv;
1291
	int ret;
1292

1293 1294 1295 1296 1297 1298 1299
	/* protect the access to the usb device */
	if (mutex_lock_interruptible(&gspca_dev->usb_lock))
		return -ERESTARTSYS;
	if (!gspca_dev->present) {
		ret = -ENODEV;
		goto out;
	}
1300 1301
	strncpy((char *) cap->driver, gspca_dev->sd_desc->name,
			sizeof cap->driver);
1302
	if (gspca_dev->dev->product != NULL) {
1303
		strncpy((char *) cap->card, gspca_dev->dev->product,
1304 1305
			sizeof cap->card);
	} else {
1306
		snprintf((char *) cap->card, sizeof cap->card,
1307 1308 1309 1310
			"USB Camera (%04x:%04x)",
			le16_to_cpu(gspca_dev->dev->descriptor.idVendor),
			le16_to_cpu(gspca_dev->dev->descriptor.idProduct));
	}
1311 1312
	usb_make_path(gspca_dev->dev, (char *) cap->bus_info,
			sizeof(cap->bus_info));
1313 1314 1315 1316
	cap->version = DRIVER_VERSION_NUMBER;
	cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
			  | V4L2_CAP_STREAMING
			  | V4L2_CAP_READWRITE;
1317 1318 1319 1320
	ret = 0;
out:
	mutex_unlock(&gspca_dev->usb_lock);
	return ret;
1321 1322
}

1323
static int get_ctrl(struct gspca_dev *gspca_dev,
1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334
				   int id)
{
	const struct ctrl *ctrls;
	int i;

	for (i = 0, ctrls = gspca_dev->sd_desc->ctrls;
	     i < gspca_dev->sd_desc->nctrls;
	     i++, ctrls++) {
		if (gspca_dev->ctrl_dis & (1 << i))
			continue;
		if (id == ctrls->qctrl.id)
1335
			return i;
1336
	}
1337
	return -1;
1338 1339
}

1340 1341 1342 1343
static int vidioc_queryctrl(struct file *file, void *priv,
			   struct v4l2_queryctrl *q_ctrl)
{
	struct gspca_dev *gspca_dev = priv;
1344
	const struct ctrl *ctrls;
1345 1346
	struct gspca_ctrl *gspca_ctrl;
	int i, idx;
1347 1348 1349 1350 1351 1352
	u32 id;

	id = q_ctrl->id;
	if (id & V4L2_CTRL_FLAG_NEXT_CTRL) {
		id &= V4L2_CTRL_ID_MASK;
		id++;
1353
		idx = -1;
1354
		for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
1355
			if (gspca_dev->ctrl_dis & (1 << i))
1356
				continue;
1357
			if (gspca_dev->sd_desc->ctrls[i].qctrl.id < id)
1358
				continue;
1359 1360
			if (idx >= 0
			 && gspca_dev->sd_desc->ctrls[i].qctrl.id
1361
				    > gspca_dev->sd_desc->ctrls[idx].qctrl.id)
1362
				continue;
1363
			idx = i;
1364
		}
1365
	} else {
1366
		idx = get_ctrl(gspca_dev, id);
1367
	}
1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378
	if (idx < 0)
		return -EINVAL;
	ctrls = &gspca_dev->sd_desc->ctrls[idx];
	memcpy(q_ctrl, &ctrls->qctrl, sizeof *q_ctrl);
	if (gspca_dev->cam.ctrls != NULL) {
		gspca_ctrl = &gspca_dev->cam.ctrls[idx];
		q_ctrl->default_value = gspca_ctrl->def;
		q_ctrl->minimum = gspca_ctrl->min;
		q_ctrl->maximum = gspca_ctrl->max;
	}
	if (gspca_dev->ctrl_inac & (1 << idx))
1379
		q_ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE;
1380
	return 0;
1381 1382 1383 1384 1385 1386
}

static int vidioc_s_ctrl(struct file *file, void *priv,
			 struct v4l2_control *ctrl)
{
	struct gspca_dev *gspca_dev = priv;
1387
	const struct ctrl *ctrls;
1388 1389
	struct gspca_ctrl *gspca_ctrl;
	int idx, ret;
1390

1391 1392
	idx = get_ctrl(gspca_dev, ctrl->id);
	if (idx < 0)
1393
		return -EINVAL;
1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407
	if (gspca_dev->ctrl_inac & (1 << idx))
		return -EINVAL;
	ctrls = &gspca_dev->sd_desc->ctrls[idx];
	if (gspca_dev->cam.ctrls != NULL) {
		gspca_ctrl = &gspca_dev->cam.ctrls[idx];
		if (ctrl->value < gspca_ctrl->min
		    || ctrl->value > gspca_ctrl->max)
			return -ERANGE;
	} else {
		gspca_ctrl = NULL;
		if (ctrl->value < ctrls->qctrl.minimum
		    || ctrl->value > ctrls->qctrl.maximum)
			return -ERANGE;
	}
1408 1409 1410
	PDEBUG(D_CONF, "set ctrl [%08x] = %d", ctrl->id, ctrl->value);
	if (mutex_lock_interruptible(&gspca_dev->usb_lock))
		return -ERESTARTSYS;
1411 1412 1413 1414
	if (!gspca_dev->present) {
		ret = -ENODEV;
		goto out;
	}
1415
	gspca_dev->usb_err = 0;
1416
	if (ctrls->set != NULL) {
1417
		ret = ctrls->set(gspca_dev, ctrl->value);
1418 1419 1420 1421 1422 1423 1424 1425 1426 1427
		goto out;
	}
	if (gspca_ctrl != NULL) {
		gspca_ctrl->val = ctrl->value;
		if (ctrls->set_control != NULL
		 && gspca_dev->streaming)
			ctrls->set_control(gspca_dev);
	}
	ret = gspca_dev->usb_err;
out:
1428 1429
	mutex_unlock(&gspca_dev->usb_lock);
	return ret;
1430 1431 1432 1433 1434 1435
}

static int vidioc_g_ctrl(struct file *file, void *priv,
			 struct v4l2_control *ctrl)
{
	struct gspca_dev *gspca_dev = priv;
1436
	const struct ctrl *ctrls;
1437
	int idx, ret;
1438

1439 1440
	idx = get_ctrl(gspca_dev, ctrl->id);
	if (idx < 0)
1441
		return -EINVAL;
1442
	ctrls = &gspca_dev->sd_desc->ctrls[idx];
1443 1444 1445

	if (mutex_lock_interruptible(&gspca_dev->usb_lock))
		return -ERESTARTSYS;
1446 1447 1448 1449
	if (!gspca_dev->present) {
		ret = -ENODEV;
		goto out;
	}
1450
	gspca_dev->usb_err = 0;
1451
	if (ctrls->get != NULL) {
1452
		ret = ctrls->get(gspca_dev, &ctrl->value);
1453 1454 1455 1456 1457 1458
		goto out;
	}
	if (gspca_dev->cam.ctrls != NULL)
		ctrl->value = gspca_dev->cam.ctrls[idx].val;
	ret = 0;
out:
1459 1460
	mutex_unlock(&gspca_dev->usb_lock);
	return ret;
1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480
}

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;
	input->type = V4L2_INPUT_TYPE_CAMERA;
1481
	input->status = gspca_dev->cam.input_flags;
1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503
	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;
1504
	int i, ret = 0, streaming;
1505

1506 1507
	i = rb->memory;			/* (avoid compilation warning) */
	switch (i) {
1508
	case GSPCA_MEMORY_READ:			/* (internal call) */
1509 1510
	case V4L2_MEMORY_MMAP:
	case V4L2_MEMORY_USERPTR:
1511
		break;
1512
	default:
1513
		return -EINVAL;
1514
	}
1515 1516
	if (mutex_lock_interruptible(&gspca_dev->queue_lock))
		return -ERESTARTSYS;
1517

1518 1519
	if (gspca_dev->memory != GSPCA_MEMORY_NO
	    && gspca_dev->memory != rb->memory) {
1520 1521 1522
		ret = -EBUSY;
		goto out;
	}
1523

1524 1525 1526 1527 1528 1529 1530 1531 1532 1533
	/* 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) {
1534 1535 1536
			ret = -EBUSY;
			goto out;
		}
1537 1538 1539
	}

	/* stop streaming */
1540 1541
	streaming = gspca_dev->streaming;
	if (streaming) {
1542
		mutex_lock(&gspca_dev->usb_lock);
1543
		gspca_dev->usb_err = 0;
1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559
		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;
1560 1561
		if (streaming)
			ret = gspca_init_transfer(gspca_dev);
1562 1563
	}
out:
1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574
	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;

1575
	if (v4l2_buf->index < 0
1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591
	    || 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;
1592 1593
	if (mutex_lock_interruptible(&gspca_dev->queue_lock))
		return -ERESTARTSYS;
1594

1595 1596 1597 1598 1599 1600
	/* check the capture file */
	if (gspca_dev->capt_file != file) {
		ret = -EBUSY;
		goto out;
	}

1601 1602
	if (gspca_dev->nframes == 0
	    || !(gspca_dev->frame[0].v4l2_buf.flags & V4L2_BUF_FLAG_QUEUED)) {
1603 1604 1605 1606 1607 1608 1609 1610
		ret = -EINVAL;
		goto out;
	}
	if (!gspca_dev->streaming) {
		ret = gspca_init_transfer(gspca_dev);
		if (ret < 0)
			goto out;
	}
1611
#ifdef GSPCA_DEBUG
1612 1613 1614 1615 1616 1617 1618
	if (gspca_debug & D_STREAM) {
		PDEBUG_MODE("stream on OK",
			gspca_dev->pixfmt,
			gspca_dev->width,
			gspca_dev->height);
	}
#endif
1619
	ret = 0;
1620 1621 1622 1623 1624 1625 1626 1627 1628
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;
1629
	int ret;
1630 1631 1632

	if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
		return -EINVAL;
1633

1634 1635
	if (mutex_lock_interruptible(&gspca_dev->queue_lock))
		return -ERESTARTSYS;
1636

1637 1638 1639 1640 1641
	if (!gspca_dev->streaming) {
		ret = 0;
		goto out;
	}

1642 1643 1644 1645 1646 1647
	/* check the capture file */
	if (gspca_dev->capt_file != file) {
		ret = -EBUSY;
		goto out;
	}

1648
	/* stop streaming */
1649 1650 1651
	if (mutex_lock_interruptible(&gspca_dev->usb_lock)) {
		ret = -ERESTARTSYS;
		goto out;
1652
	}
1653
	gspca_dev->usb_err = 0;
1654 1655
	gspca_stream_off(gspca_dev);
	mutex_unlock(&gspca_dev->usb_lock);
1656

1657 1658 1659 1660
	/* empty the transfer queues */
	atomic_set(&gspca_dev->fr_q, 0);
	atomic_set(&gspca_dev->fr_i, 0);
	gspca_dev->fr_o = 0;
1661
	ret = 0;
1662 1663 1664
out:
	mutex_unlock(&gspca_dev->queue_lock);
	return ret;
1665 1666 1667 1668 1669 1670 1671 1672 1673 1674
}

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;
1675 1676
	if (mutex_lock_interruptible(&gspca_dev->usb_lock))
		return -ERESTARTSYS;
1677
	gspca_dev->usb_err = 0;
1678 1679 1680 1681
	if (gspca_dev->present)
		ret = gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
	else
		ret = -ENODEV;
1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693
	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 (!gspca_dev->sd_desc->set_jcomp)
		return -EINVAL;
1694 1695
	if (mutex_lock_interruptible(&gspca_dev->usb_lock))
		return -ERESTARTSYS;
1696
	gspca_dev->usb_err = 0;
1697 1698 1699 1700
	if (gspca_dev->present)
		ret = gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
	else
		ret = -ENODEV;
1701 1702 1703 1704 1705 1706 1707 1708 1709 1710
	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;

	parm->parm.capture.readbuffers = gspca_dev->nbufread;
1711 1712 1713 1714 1715 1716

	if (gspca_dev->sd_desc->get_streamparm) {
		int ret;

		if (mutex_lock_interruptible(&gspca_dev->usb_lock))
			return -ERESTARTSYS;
1717 1718 1719 1720 1721
		if (gspca_dev->present) {
			gspca_dev->usb_err = 0;
			gspca_dev->sd_desc->get_streamparm(gspca_dev, parm);
			ret = gspca_dev->usb_err;
		} else {
1722
			ret = -ENODEV;
1723
		}
1724 1725 1726 1727
		mutex_unlock(&gspca_dev->usb_lock);
		return ret;
	}

1728 1729 1730 1731 1732 1733 1734 1735 1736 1737
	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;
1738
	if (n == 0 || n >= GSPCA_MAX_FRAMES)
1739 1740 1741
		parm->parm.capture.readbuffers = gspca_dev->nbufread;
	else
		gspca_dev->nbufread = n;
1742 1743 1744 1745 1746 1747

	if (gspca_dev->sd_desc->set_streamparm) {
		int ret;

		if (mutex_lock_interruptible(&gspca_dev->usb_lock))
			return -ERESTARTSYS;
1748 1749 1750 1751 1752
		if (gspca_dev->present) {
			gspca_dev->usb_err = 0;
			gspca_dev->sd_desc->set_streamparm(gspca_dev, parm);
			ret = gspca_dev->usb_err;
		} else {
1753
			ret = -ENODEV;
1754
		}
1755 1756 1757 1758
		mutex_unlock(&gspca_dev->usb_lock);
		return ret;
	}

1759 1760 1761 1762 1763 1764
	return 0;
}

static int dev_mmap(struct file *file, struct vm_area_struct *vma)
{
	struct gspca_dev *gspca_dev = file->private_data;
1765
	struct gspca_frame *frame;
1766 1767 1768 1769 1770 1771 1772 1773
	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);

1774 1775
	if (mutex_lock_interruptible(&gspca_dev->queue_lock))
		return -ERESTARTSYS;
1776 1777
	if (!gspca_dev->present) {
		ret = -ENODEV;
1778 1779 1780 1781 1782
		goto out;
	}
	if (gspca_dev->capt_file != file) {
		ret = -EINVAL;
		goto out;
1783 1784
	}

1785
	frame = NULL;
1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796
	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;
		}
	}
1797
	if (frame == NULL) {
1798 1799
		PDEBUG(D_STREAM, "mmap no frame buffer found");
		ret = -EINVAL;
1800
		goto out;
1801
	}
1802
	if (size != frame->v4l2_buf.length) {
1803 1804
		PDEBUG(D_STREAM, "mmap bad size");
		ret = -EINVAL;
1805
		goto out;
1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818
	}

	/*
	 * - 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)
1819
			goto out;
1820 1821 1822 1823 1824
		start += PAGE_SIZE;
		addr += PAGE_SIZE;
		size -= PAGE_SIZE;
	}

1825
	vma->vm_ops = &gspca_vm_ops;
1826 1827
	vma->vm_private_data = frame;
	gspca_vm_open(vma);
1828
	ret = 0;
1829
out:
1830 1831 1832 1833 1834 1835 1836 1837 1838
	mutex_unlock(&gspca_dev->queue_lock);
	return ret;
}

/*
 * wait for a video frame
 *
 * If a frame is ready, its index is returned.
 */
1839
static int frame_wait(struct gspca_dev *gspca_dev,
1840 1841
			int nonblock_ing)
{
1842
	int i, ret;
1843

1844
	/* check if a frame is ready */
1845
	i = gspca_dev->fr_o;
1846
	if (i == atomic_read(&gspca_dev->fr_i)) {
1847 1848 1849 1850
		if (nonblock_ing)
			return -EAGAIN;

		/* wait till a frame is ready */
1851
		ret = wait_event_interruptible_timeout(gspca_dev->wq,
1852
			i != atomic_read(&gspca_dev->fr_i) ||
1853 1854 1855 1856 1857
			!gspca_dev->streaming || !gspca_dev->present,
			msecs_to_jiffies(3000));
		if (ret < 0)
			return ret;
		if (ret == 0 || !gspca_dev->streaming || !gspca_dev->present)
1858
			return -EIO;
1859
	}
1860

1861
	gspca_dev->fr_o = (i + 1) % GSPCA_MAX_FRAMES;
1862

1863 1864
	if (gspca_dev->sd_desc->dq_callback) {
		mutex_lock(&gspca_dev->usb_lock);
1865
		gspca_dev->usb_err = 0;
1866 1867
		if (gspca_dev->present)
			gspca_dev->sd_desc->dq_callback(gspca_dev);
1868 1869
		mutex_unlock(&gspca_dev->usb_lock);
	}
1870
	return gspca_dev->fr_queue[i];
1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885
}

/*
 * 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");
1886
	if (v4l2_buf->memory != gspca_dev->memory)
1887
		return -EINVAL;
1888

1889 1890 1891
	if (!gspca_dev->present)
		return -ENODEV;

1892 1893 1894
	/* if not streaming, be sure the application will not loop forever */
	if (!(file->f_flags & O_NONBLOCK)
	    && !gspca_dev->streaming && gspca_dev->users == 1)
1895 1896
		return -EINVAL;

1897 1898 1899 1900 1901
	/* only the capturing file may dequeue */
	if (gspca_dev->capt_file != file)
		return -EINVAL;

	/* only one dequeue / read at a time */
1902 1903 1904
	if (mutex_lock_interruptible(&gspca_dev->read_lock))
		return -ERESTARTSYS;

1905
	ret = frame_wait(gspca_dev, file->f_flags & O_NONBLOCK);
1906
	if (ret < 0)
1907
		goto out;
1908 1909
	i = ret;				/* frame index */
	frame = &gspca_dev->frame[i];
1910
	if (gspca_dev->memory == V4L2_MEMORY_USERPTR) {
1911
		if (copy_to_user((__u8 __user *) frame->v4l2_buf.m.userptr,
1912 1913 1914 1915 1916 1917 1918 1919
				 frame->data,
				 frame->v4l2_buf.bytesused)) {
			PDEBUG(D_ERR|D_STREAM,
				"dqbuf cp to user failed");
			ret = -EFAULT;
			goto out;
		}
	}
1920 1921 1922 1923
	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;
1924
out:
1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943
	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);

1944 1945 1946
	if (mutex_lock_interruptible(&gspca_dev->queue_lock))
		return -ERESTARTSYS;

1947 1948
	index = v4l2_buf->index;
	if ((unsigned) index >= gspca_dev->nframes) {
1949
		PDEBUG(D_FRAM,
1950
			"qbuf idx %d >= %d", index, gspca_dev->nframes);
1951 1952
		ret = -EINVAL;
		goto out;
1953
	}
1954
	if (v4l2_buf->memory != gspca_dev->memory) {
1955
		PDEBUG(D_FRAM, "qbuf bad memory type");
1956 1957
		ret = -EINVAL;
		goto out;
1958
	}
1959

1960
	frame = &gspca_dev->frame[index];
1961 1962
	if (frame->v4l2_buf.flags & BUF_ALL_FLAGS) {
		PDEBUG(D_FRAM, "qbuf bad state");
1963 1964 1965 1966 1967 1968
		ret = -EINVAL;
		goto out;
	}

	frame->v4l2_buf.flags |= V4L2_BUF_FLAG_QUEUED;

1969
	if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) {
1970 1971 1972 1973 1974
		frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr;
		frame->v4l2_buf.length = v4l2_buf->length;
	}

	/* put the buffer in the 'queued' queue */
1975
	i = atomic_read(&gspca_dev->fr_q);
1976
	gspca_dev->fr_queue[i] = index;
1977
	atomic_set(&gspca_dev->fr_q, (i + 1) % GSPCA_MAX_FRAMES);
1978 1979 1980 1981 1982 1983 1984 1985 1986

	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;
}

1987 1988 1989 1990 1991
/*
 * allocate the resources for read()
 */
static int read_alloc(struct gspca_dev *gspca_dev,
			struct file *file)
1992 1993
{
	struct v4l2_buffer v4l2_buf;
1994
	int i, ret;
1995

1996
	PDEBUG(D_STREAM, "read alloc");
1997 1998 1999 2000 2001 2002
	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;
2003
		rb.memory = GSPCA_MEMORY_READ;
2004 2005
		ret = vidioc_reqbufs(file, gspca_dev, &rb);
		if (ret != 0) {
2006
			PDEBUG(D_STREAM, "read reqbuf err %d", ret);
2007 2008 2009 2010
			return ret;
		}
		memset(&v4l2_buf, 0, sizeof v4l2_buf);
		v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2011
		v4l2_buf.memory = GSPCA_MEMORY_READ;
2012 2013 2014 2015 2016 2017 2018 2019
		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;
			}
		}
2020 2021
		gspca_dev->memory = GSPCA_MEMORY_READ;
	}
2022

2023 2024 2025 2026 2027 2028 2029 2030 2031 2032
	/* 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;
2033
	int ret;
2034 2035 2036 2037 2038

	PDEBUG(D_FRAM, "poll");

	poll_wait(file, &gspca_dev->wq, wait);

2039 2040 2041 2042
	/* 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 */
2043
		ret = read_alloc(gspca_dev, file);
2044 2045
		if (ret != 0)
			return POLLERR;
2046 2047
	}

2048 2049 2050
	if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0)
		return POLLERR;

2051 2052 2053
	/* check if an image has been received */
	if (gspca_dev->fr_o != atomic_read(&gspca_dev->fr_i))
		ret = POLLIN | POLLRDNORM;	/* yes */
2054 2055 2056
	else
		ret = 0;
	mutex_unlock(&gspca_dev->queue_lock);
2057 2058
	if (!gspca_dev->present)
		return POLLHUP;
2059 2060 2061 2062 2063 2064 2065 2066 2067 2068
	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;
2069
	int n, ret, ret2;
2070

2071
	PDEBUG(D_FRAM, "read (%zd)", count);
2072 2073 2074 2075 2076 2077 2078 2079 2080
	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:
2081 2082 2083
		if (gspca_dev->capt_file == file)
			break;
		/* fall thru */
2084 2085 2086 2087
	default:
		return -EINVAL;
	}

2088
	/* get a frame */
2089
	timestamp = ktime_to_timeval(ktime_get());
2090
	timestamp.tv_sec--;
2091 2092
	n = 2;
	for (;;) {
2093 2094
		memset(&v4l2_buf, 0, sizeof v4l2_buf);
		v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2095
		v4l2_buf.memory = GSPCA_MEMORY_READ;
2096 2097 2098 2099 2100 2101 2102
		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,
2103
		 * get a newer frame */
2104
		frame = &gspca_dev->frame[v4l2_buf.index];
2105 2106
		if (--n < 0)
			break;			/* avoid infinite loop */
2107 2108 2109 2110 2111 2112 2113 2114 2115 2116
		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 */
2117 2118
	if (count > frame->v4l2_buf.bytesused)
		count = frame->v4l2_buf.bytesused;
2119 2120 2121
	ret = copy_to_user(data, frame->data, count);
	if (ret != 0) {
		PDEBUG(D_ERR|D_STREAM,
2122
			"read cp to user lack %d / %zd", ret, count);
2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134
		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;
}

2135
static struct v4l2_file_operations dev_fops = {
2136 2137 2138 2139 2140
	.owner = THIS_MODULE,
	.open = dev_open,
	.release = dev_close,
	.read = dev_read,
	.mmap = dev_mmap,
2141
	.unlocked_ioctl = video_ioctl2,
2142 2143 2144
	.poll	= dev_poll,
};

2145
static const struct v4l2_ioctl_ops dev_ioctl_ops = {
2146 2147 2148
	.vidioc_querycap	= vidioc_querycap,
	.vidioc_dqbuf		= vidioc_dqbuf,
	.vidioc_qbuf		= vidioc_qbuf,
2149 2150 2151 2152
	.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,
2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167
	.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,
2168
	.vidioc_enum_framesizes = vidioc_enum_framesizes,
2169
	.vidioc_enum_frameintervals = vidioc_enum_frameintervals,
2170 2171 2172 2173 2174
#ifdef CONFIG_VIDEO_ADV_DEBUG
	.vidioc_g_register	= vidioc_g_register,
	.vidioc_s_register	= vidioc_s_register,
#endif
	.vidioc_g_chip_ident	= vidioc_g_chip_ident,
2175 2176
};

2177 2178 2179 2180
static struct video_device gspca_template = {
	.name = "gspca main driver",
	.fops = &dev_fops,
	.ioctl_ops = &dev_ioctl_ops,
2181
	.release = gspca_release,
2182 2183
};

2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199
/* initialize the controls */
static void ctrls_init(struct gspca_dev *gspca_dev)
{
	struct gspca_ctrl *ctrl;
	int i;

	for (i = 0, ctrl = gspca_dev->cam.ctrls;
	     i < gspca_dev->sd_desc->nctrls;
	     i++, ctrl++) {
		ctrl->def = gspca_dev->sd_desc->ctrls[i].qctrl.default_value;
		ctrl->val = ctrl->def;
		ctrl->min = gspca_dev->sd_desc->ctrls[i].qctrl.minimum;
		ctrl->max = gspca_dev->sd_desc->ctrls[i].qctrl.maximum;
	}
}

2200 2201 2202 2203 2204 2205
/*
 * 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.
 */
2206
int gspca_dev_probe2(struct usb_interface *intf,
2207 2208
		const struct usb_device_id *id,
		const struct sd_desc *sd_desc,
2209 2210
		int dev_size,
		struct module *module)
2211 2212 2213 2214 2215
{
	struct gspca_dev *gspca_dev;
	struct usb_device *dev = interface_to_usbdev(intf);
	int ret;

2216
	PDEBUG(D_PROBE, "probing %04x:%04x", id->idVendor, id->idProduct);
2217 2218 2219 2220 2221

	/* create the device */
	if (dev_size < sizeof *gspca_dev)
		dev_size = sizeof *gspca_dev;
	gspca_dev = kzalloc(dev_size, GFP_KERNEL);
2222
	if (!gspca_dev) {
2223
		err("couldn't kzalloc gspca struct");
2224
		return -ENOMEM;
2225
	}
2226 2227 2228
	gspca_dev->usb_buf = kmalloc(USB_BUF_SZ, GFP_KERNEL);
	if (!gspca_dev->usb_buf) {
		err("out of memory");
2229
		ret = -ENOMEM;
2230 2231
		goto out;
	}
2232
	gspca_dev->dev = dev;
2233
	gspca_dev->iface = intf->cur_altsetting->desc.bInterfaceNumber;
2234
	gspca_dev->nbalt = intf->num_altsetting;
2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252

	/* check if any audio device */
	if (dev->config->desc.bNumInterfaces != 1) {
		int i;
		struct usb_interface *intf2;

		for (i = 0; i < dev->config->desc.bNumInterfaces; i++) {
			intf2 = dev->config->interface[i];
			if (intf2 != NULL
			 && intf2->altsetting != NULL
			 && intf2->altsetting->desc.bInterfaceClass ==
					 USB_CLASS_AUDIO) {
				gspca_dev->audio = 1;
				break;
			}
		}
	}

2253 2254
	gspca_dev->sd_desc = sd_desc;
	gspca_dev->nbufread = 2;
2255
	gspca_dev->empty_packet = -1;	/* don't check the empty packets */
2256

2257
	/* configure the subdriver and initialize the USB device */
2258
	ret = sd_desc->config(gspca_dev, id);
2259 2260
	if (ret < 0)
		goto out;
2261 2262
	if (gspca_dev->cam.ctrls != NULL)
		ctrls_init(gspca_dev);
2263
	ret = sd_desc->init(gspca_dev);
2264 2265 2266 2267
	if (ret < 0)
		goto out;
	gspca_set_default_mode(gspca_dev);

2268 2269 2270 2271
	ret = gspca_input_connect(gspca_dev);
	if (ret)
		goto out;

2272 2273 2274 2275 2276 2277
	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 */
2278
	memcpy(&gspca_dev->vdev, &gspca_template, sizeof gspca_template);
2279
	gspca_dev->vdev.parent = &intf->dev;
2280
	gspca_dev->module = module;
2281
	gspca_dev->present = 1;
2282
	ret = video_register_device(&gspca_dev->vdev,
2283
				  VFL_TYPE_GRABBER,
2284
				  -1);
2285 2286 2287 2288 2289 2290
	if (ret < 0) {
		err("video_register_device err %d", ret);
		goto out;
	}

	usb_set_intfdata(intf, gspca_dev);
2291
	PDEBUG(D_PROBE, "%s created", video_device_node_name(&gspca_dev->vdev));
2292

2293
	gspca_input_create_urb(gspca_dev);
2294

2295 2296
	return 0;
out:
2297
#if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
2298 2299
	if (gspca_dev->input_dev)
		input_unregister_device(gspca_dev->input_dev);
2300
#endif
2301 2302
	kfree(gspca_dev->usb_buf);
	kfree(gspca_dev);
2303 2304
	return ret;
}
2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317
EXPORT_SYMBOL(gspca_dev_probe2);

/* same function as the previous one, but check the interface */
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_device *dev = interface_to_usbdev(intf);

	/* we don't handle multi-config cameras */
	if (dev->descriptor.bNumConfigurations != 1) {
2318
		err("%04x:%04x too many config",
2319 2320 2321 2322 2323 2324
				id->idVendor, id->idProduct);
		return -ENODEV;
	}

	/* the USB video interface must be the first one */
	if (dev->config->desc.bNumInterfaces != 1
2325
	 && intf->cur_altsetting->desc.bInterfaceNumber != 0)
2326 2327 2328 2329
		return -ENODEV;

	return gspca_dev_probe2(intf, id, sd_desc, dev_size, module);
}
2330 2331 2332 2333 2334 2335 2336 2337 2338 2339
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)
{
2340
	struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
2341
#if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
2342
	struct input_dev *input_dev;
2343
#endif
2344

2345 2346
	PDEBUG(D_PROBE, "%s disconnect",
		video_device_node_name(&gspca_dev->vdev));
2347
	mutex_lock(&gspca_dev->usb_lock);
2348

2349
	gspca_dev->present = 0;
2350
	wake_up_interruptible(&gspca_dev->wq);
2351

2352
	destroy_urbs(gspca_dev);
2353

2354
#if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
2355 2356 2357 2358 2359 2360
	gspca_input_destroy_urb(gspca_dev);
	input_dev = gspca_dev->input_dev;
	if (input_dev) {
		gspca_dev->input_dev = NULL;
		input_unregister_device(input_dev);
	}
2361
#endif
2362

2363
	/* the device is freed at exit of this function */
2364
	gspca_dev->dev = NULL;
2365 2366
	mutex_unlock(&gspca_dev->usb_lock);

2367 2368
	usb_set_intfdata(intf, NULL);

2369 2370 2371
	/* release the device */
	/* (this will call gspca_release() immediatly or on last close) */
	video_unregister_device(&gspca_dev->vdev);
2372

2373
/*	PDEBUG(D_PROBE, "disconnect complete"); */
2374 2375 2376
}
EXPORT_SYMBOL(gspca_disconnect);

2377 2378 2379 2380 2381 2382 2383 2384
#ifdef CONFIG_PM
int gspca_suspend(struct usb_interface *intf, pm_message_t message)
{
	struct gspca_dev *gspca_dev = usb_get_intfdata(intf);

	if (!gspca_dev->streaming)
		return 0;
	gspca_dev->frozen = 1;		/* avoid urb error messages */
2385 2386
	if (gspca_dev->sd_desc->stopN)
		gspca_dev->sd_desc->stopN(gspca_dev);
2387
	destroy_urbs(gspca_dev);
2388
	gspca_input_destroy_urb(gspca_dev);
2389
	gspca_set_alt0(gspca_dev);
2390 2391
	if (gspca_dev->sd_desc->stop0)
		gspca_dev->sd_desc->stop0(gspca_dev);
2392 2393 2394 2395 2396 2397 2398 2399 2400
	return 0;
}
EXPORT_SYMBOL(gspca_suspend);

int gspca_resume(struct usb_interface *intf)
{
	struct gspca_dev *gspca_dev = usb_get_intfdata(intf);

	gspca_dev->frozen = 0;
2401
	gspca_dev->sd_desc->init(gspca_dev);
2402
	gspca_input_create_urb(gspca_dev);
2403 2404
	if (gspca_dev->streaming)
		return gspca_init_transfer(gspca_dev);
2405
	return 0;
2406 2407 2408
}
EXPORT_SYMBOL(gspca_resume);
#endif
2409 2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425
/* -- 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++) {
2426 2427
		if (gspca_dev->ctrl_dis & (1 << i))
			continue;
2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452
		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;

2453
	PDEBUG(D_FRAM, "autogain: lum: %d, desired: %d, steps: %d",
2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 2494 2495 2496 2497 2498
		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);

2499 2500 2501
/* -- module insert / remove -- */
static int __init gspca_init(void)
{
2502
	info("v%d.%d.%d registered",
2503 2504 2505
		(DRIVER_VERSION_NUMBER >> 16) & 0xff,
		(DRIVER_VERSION_NUMBER >> 8) & 0xff,
		DRIVER_VERSION_NUMBER & 0xff);
2506 2507 2508 2509 2510 2511 2512 2513 2514
	return 0;
}
static void __exit gspca_exit(void)
{
}

module_init(gspca_init);
module_exit(gspca_exit);

2515
#ifdef GSPCA_DEBUG
2516 2517 2518
module_param_named(debug, gspca_debug, int, 0644);
MODULE_PARM_DESC(debug,
		"Debug (bit) 0x01:error 0x02:probe 0x04:config"
2519 2520
		" 0x08:stream 0x10:frame 0x20:packet 0x40:USBin 0x80:USBout"
		" 0x0100: v4l2");
2521
#endif