gspca.c

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * Main USB camera driver
   4 *
   5 * Copyright (C) 2008-2011 Jean-François Moine <http://moinejf.free.fr>
   6 *
   7 * Camera button input handling by Márton Németh
   8 * Copyright (C) 2009-2010 Márton Németh <nm127@freemail.hu>
   9 */
  10
  11#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  12
  13#define GSPCA_VERSION	"2.14.0"
  14
  15#include <linux/init.h>
  16#include <linux/fs.h>
  17#include <linux/vmalloc.h>
  18#include <linux/sched.h>
  19#include <linux/slab.h>
  20#include <linux/mm.h>
  21#include <linux/string.h>
  22#include <linux/pagemap.h>
  23#include <linux/io.h>
  24#include <asm/page.h>
  25#include <linux/uaccess.h>
  26#include <linux/ktime.h>
  27#include <media/v4l2-ioctl.h>
  28#include <media/v4l2-ctrls.h>
  29#include <media/v4l2-fh.h>
  30#include <media/v4l2-event.h>
  31
  32#include "gspca.h"
  33
  34#if IS_ENABLED(CONFIG_INPUT)
  35#include <linux/input.h>
  36#include <linux/usb/input.h>
  37#endif
  38
  39/* global values */
  40#define DEF_NURBS 3		/* default number of URBs */
  41#if DEF_NURBS > MAX_NURBS
  42#error "DEF_NURBS too big"
  43#endif
  44
  45MODULE_AUTHOR("Jean-François Moine <http://moinejf.free.fr>");
  46MODULE_DESCRIPTION("GSPCA USB Camera Driver");
  47MODULE_LICENSE("GPL");
  48MODULE_VERSION(GSPCA_VERSION);
  49
  50int gspca_debug;
  51EXPORT_SYMBOL(gspca_debug);
  52
  53static void PDEBUG_MODE(struct gspca_dev *gspca_dev, int debug, char *txt,
  54			__u32 pixfmt, int w, int h)
  55{
  56	if ((pixfmt >> 24) >= '0' && (pixfmt >> 24) <= 'z') {
  57		gspca_dbg(gspca_dev, debug, "%s %c%c%c%c %dx%d\n",
  58			  txt,
  59			  pixfmt & 0xff,
  60			  (pixfmt >> 8) & 0xff,
  61			  (pixfmt >> 16) & 0xff,
  62			  pixfmt >> 24,
  63			  w, h);
  64	} else {
  65		gspca_dbg(gspca_dev, debug, "%s 0x%08x %dx%d\n",
  66			  txt,
  67			  pixfmt,
  68			  w, h);
  69	}
  70}
  71
  72/* specific memory types - !! should be different from V4L2_MEMORY_xxx */
  73#define GSPCA_MEMORY_NO 0	/* V4L2_MEMORY_xxx starts from 1 */
  74#define GSPCA_MEMORY_READ 7
  75
  76/*
  77 * Input and interrupt endpoint handling functions
  78 */
  79#if IS_ENABLED(CONFIG_INPUT)
  80static void int_irq(struct urb *urb)
  81{
  82	struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
  83	int ret;
  84
  85	ret = urb->status;
  86	switch (ret) {
  87	case 0:
  88		if (gspca_dev->sd_desc->int_pkt_scan(gspca_dev,
  89		    urb->transfer_buffer, urb->actual_length) < 0) {
  90			gspca_err(gspca_dev, "Unknown packet received\n");
  91		}
  92		break;
  93
  94	case -ENOENT:
  95	case -ECONNRESET:
  96	case -ENODEV:
  97	case -ESHUTDOWN:
  98		/* Stop is requested either by software or hardware is gone,
  99		 * keep the ret value non-zero and don't resubmit later.
 100		 */
 101		break;
 102
 103	default:
 104		gspca_err(gspca_dev, "URB error %i, resubmitting\n",
 105			  urb->status);
 106		urb->status = 0;
 107		ret = 0;
 108	}
 109
 110	if (ret == 0) {
 111		ret = usb_submit_urb(urb, GFP_ATOMIC);
 112		if (ret < 0)
 113			pr_err("Resubmit URB failed with error %i\n", ret);
 114	}
 115}
 116
 117static int gspca_input_connect(struct gspca_dev *dev)
 118{
 119	struct input_dev *input_dev;
 120	int err = 0;
 121
 122	dev->input_dev = NULL;
 123	if (dev->sd_desc->int_pkt_scan || dev->sd_desc->other_input)  {
 124		input_dev = input_allocate_device();
 125		if (!input_dev)
 126			return -ENOMEM;
 127
 128		usb_make_path(dev->dev, dev->phys, sizeof(dev->phys));
 129		strlcat(dev->phys, "/input0", sizeof(dev->phys));
 130
 131		input_dev->name = dev->sd_desc->name;
 132		input_dev->phys = dev->phys;
 133
 134		usb_to_input_id(dev->dev, &input_dev->id);
 135
 136		input_dev->evbit[0] = BIT_MASK(EV_KEY);
 137		input_dev->keybit[BIT_WORD(KEY_CAMERA)] = BIT_MASK(KEY_CAMERA);
 138		input_dev->dev.parent = &dev->dev->dev;
 139
 140		err = input_register_device(input_dev);
 141		if (err) {
 142			pr_err("Input device registration failed with error %i\n",
 143			       err);
 144			input_dev->dev.parent = NULL;
 145			input_free_device(input_dev);
 146		} else {
 147			dev->input_dev = input_dev;
 148		}
 149	}
 150
 151	return err;
 152}
 153
 154static int alloc_and_submit_int_urb(struct gspca_dev *gspca_dev,
 155			  struct usb_endpoint_descriptor *ep)
 156{
 157	unsigned int buffer_len;
 158	int interval;
 159	struct urb *urb;
 160	struct usb_device *dev;
 161	void *buffer = NULL;
 162	int ret = -EINVAL;
 163
 164	buffer_len = le16_to_cpu(ep->wMaxPacketSize);
 165	interval = ep->bInterval;
 166	gspca_dbg(gspca_dev, D_CONF, "found int in endpoint: 0x%x, buffer_len=%u, interval=%u\n",
 167		  ep->bEndpointAddress, buffer_len, interval);
 168
 169	dev = gspca_dev->dev;
 170
 171	urb = usb_alloc_urb(0, GFP_KERNEL);
 172	if (!urb) {
 173		ret = -ENOMEM;
 174		goto error;
 175	}
 176
 177	buffer = usb_alloc_coherent(dev, buffer_len,
 178				GFP_KERNEL, &urb->transfer_dma);
 179	if (!buffer) {
 180		ret = -ENOMEM;
 181		goto error_buffer;
 182	}
 183	usb_fill_int_urb(urb, dev,
 184		usb_rcvintpipe(dev, ep->bEndpointAddress),
 185		buffer, buffer_len,
 186		int_irq, (void *)gspca_dev, interval);
 187	urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 188	ret = usb_submit_urb(urb, GFP_KERNEL);
 189	if (ret < 0) {
 190		gspca_err(gspca_dev, "submit int URB failed with error %i\n",
 191			  ret);
 192		goto error_submit;
 193	}
 194	gspca_dev->int_urb = urb;
 195	return ret;
 196
 197error_submit:
 198	usb_free_coherent(dev,
 199			  urb->transfer_buffer_length,
 200			  urb->transfer_buffer,
 201			  urb->transfer_dma);
 202error_buffer:
 203	usb_free_urb(urb);
 204error:
 205	return ret;
 206}
 207
 208static void gspca_input_create_urb(struct gspca_dev *gspca_dev)
 209{
 210	struct usb_interface *intf;
 211	struct usb_host_interface *intf_desc;
 212	struct usb_endpoint_descriptor *ep;
 213	int i;
 214
 215	if (gspca_dev->sd_desc->int_pkt_scan)  {
 216		intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
 217		intf_desc = intf->cur_altsetting;
 218		for (i = 0; i < intf_desc->desc.bNumEndpoints; i++) {
 219			ep = &intf_desc->endpoint[i].desc;
 220			if (usb_endpoint_dir_in(ep) &&
 221			    usb_endpoint_xfer_int(ep)) {
 222
 223				alloc_and_submit_int_urb(gspca_dev, ep);
 224				break;
 225			}
 226		}
 227	}
 228}
 229
 230static void gspca_input_destroy_urb(struct gspca_dev *gspca_dev)
 231{
 232	struct urb *urb;
 233
 234	urb = gspca_dev->int_urb;
 235	if (urb) {
 236		gspca_dev->int_urb = NULL;
 237		usb_kill_urb(urb);
 238		usb_free_coherent(gspca_dev->dev,
 239				  urb->transfer_buffer_length,
 240				  urb->transfer_buffer,
 241				  urb->transfer_dma);
 242		usb_free_urb(urb);
 243	}
 244}
 245#else
 246static inline void gspca_input_destroy_urb(struct gspca_dev *gspca_dev)
 247{
 248}
 249
 250static inline void gspca_input_create_urb(struct gspca_dev *gspca_dev)
 251{
 252}
 253
 254static inline int gspca_input_connect(struct gspca_dev *dev)
 255{
 256	return 0;
 257}
 258#endif
 259
 260/*
 261 * fill a video frame from an URB and resubmit
 262 */
 263static void fill_frame(struct gspca_dev *gspca_dev,
 264			struct urb *urb)
 265{
 266	u8 *data;		/* address of data in the iso message */
 267	int i, len, st;
 268	cam_pkt_op pkt_scan;
 269
 270	if (urb->status != 0) {
 271		if (urb->status == -ESHUTDOWN)
 272			return;		/* disconnection */
 273#ifdef CONFIG_PM
 274		if (gspca_dev->frozen)
 275			return;
 276#endif
 277		gspca_err(gspca_dev, "urb status: %d\n", urb->status);
 278		urb->status = 0;
 279		goto resubmit;
 280	}
 281	pkt_scan = gspca_dev->sd_desc->pkt_scan;
 282	for (i = 0; i < urb->number_of_packets; i++) {
 283		len = urb->iso_frame_desc[i].actual_length;
 284
 285		/* check the packet status and length */
 286		st = urb->iso_frame_desc[i].status;
 287		if (st) {
 288			gspca_dbg(gspca_dev, D_PACK, "ISOC data error: [%d] len=%d, status=%d\n",
 289			       i, len, st);
 290			gspca_dev->last_packet_type = DISCARD_PACKET;
 291			continue;
 292		}
 293		if (len == 0) {
 294			if (gspca_dev->empty_packet == 0)
 295				gspca_dev->empty_packet = 1;
 296			continue;
 297		}
 298
 299		/* let the packet be analyzed by the subdriver */
 300		gspca_dbg(gspca_dev, D_PACK, "packet [%d] o:%d l:%d\n",
 301			  i, urb->iso_frame_desc[i].offset, len);
 302		data = (u8 *) urb->transfer_buffer
 303					+ urb->iso_frame_desc[i].offset;
 304		pkt_scan(gspca_dev, data, len);
 305	}
 306
 307resubmit:
 308	if (!gspca_dev->streaming)
 309		return;
 310	/* resubmit the URB */
 311	st = usb_submit_urb(urb, GFP_ATOMIC);
 312	if (st < 0)
 313		pr_err("usb_submit_urb() ret %d\n", st);
 314}
 315
 316/*
 317 * ISOC message interrupt from the USB device
 318 *
 319 * Analyse each packet and call the subdriver for copy to the frame buffer.
 320 */
 321static void isoc_irq(struct urb *urb)
 322{
 323	struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
 324
 325	gspca_dbg(gspca_dev, D_PACK, "isoc irq\n");
 326	if (!gspca_dev->streaming)
 327		return;
 328	fill_frame(gspca_dev, urb);
 329}
 330
 331/*
 332 * bulk message interrupt from the USB device
 333 */
 334static void bulk_irq(struct urb *urb)
 335{
 336	struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
 337	int st;
 338
 339	gspca_dbg(gspca_dev, D_PACK, "bulk irq\n");
 340	if (!gspca_dev->streaming)
 341		return;
 342	switch (urb->status) {
 343	case 0:
 344		break;
 345	case -ESHUTDOWN:
 346		return;		/* disconnection */
 347	default:
 348#ifdef CONFIG_PM
 349		if (gspca_dev->frozen)
 350			return;
 351#endif
 352		gspca_err(gspca_dev, "urb status: %d\n", urb->status);
 353		urb->status = 0;
 354		goto resubmit;
 355	}
 356
 357	gspca_dbg(gspca_dev, D_PACK, "packet l:%d\n", urb->actual_length);
 358	gspca_dev->sd_desc->pkt_scan(gspca_dev,
 359				urb->transfer_buffer,
 360				urb->actual_length);
 361
 362resubmit:
 363	if (!gspca_dev->streaming)
 364		return;
 365	/* resubmit the URB */
 366	if (gspca_dev->cam.bulk_nurbs != 0) {
 367		st = usb_submit_urb(urb, GFP_ATOMIC);
 368		if (st < 0)
 369			pr_err("usb_submit_urb() ret %d\n", st);
 370	}
 371}
 372
 373/*
 374 * add data to the current frame
 375 *
 376 * This function is called by the subdrivers at interrupt level.
 377 *
 378 * To build a frame, these ones must add
 379 *	- one FIRST_PACKET
 380 *	- 0 or many INTER_PACKETs
 381 *	- one LAST_PACKET
 382 * DISCARD_PACKET invalidates the whole frame.
 383 */
 384void gspca_frame_add(struct gspca_dev *gspca_dev,
 385			enum gspca_packet_type packet_type,
 386			const u8 *data,
 387			int len)
 388{
 389	struct gspca_buffer *buf;
 390	unsigned long flags;
 391
 392	gspca_dbg(gspca_dev, D_PACK, "add t:%d l:%d\n",	packet_type, len);
 393
 394	spin_lock_irqsave(&gspca_dev->qlock, flags);
 395	buf = list_first_entry_or_null(&gspca_dev->buf_list,
 396				       typeof(*buf), list);
 397	spin_unlock_irqrestore(&gspca_dev->qlock, flags);
 398
 399	if (packet_type == FIRST_PACKET) {
 400		/* if there is no queued buffer, discard the whole frame */
 401		if (!buf) {
 402			gspca_dev->last_packet_type = DISCARD_PACKET;
 403			gspca_dev->sequence++;
 404			return;
 405		}
 406		gspca_dev->image = vb2_plane_vaddr(&buf->vb.vb2_buf, 0);
 407		gspca_dev->image_len = 0;
 408	} else {
 409		switch (gspca_dev->last_packet_type) {
 410		case DISCARD_PACKET:
 411			if (packet_type == LAST_PACKET) {
 412				gspca_dev->last_packet_type = packet_type;
 413				gspca_dev->image = NULL;
 414				gspca_dev->image_len = 0;
 415			}
 416			return;
 417		case LAST_PACKET:
 418			return;
 419		}
 420	}
 421
 422	/* append the packet to the frame buffer */
 423	if (len > 0) {
 424		if (gspca_dev->image_len + len > PAGE_ALIGN(gspca_dev->pixfmt.sizeimage)) {
 425			gspca_err(gspca_dev, "frame overflow %d > %d\n",
 426				  gspca_dev->image_len + len,
 427				  PAGE_ALIGN(gspca_dev->pixfmt.sizeimage));
 428			packet_type = DISCARD_PACKET;
 429		} else {
 430/* !! image is NULL only when last pkt is LAST or DISCARD
 431			if (gspca_dev->image == NULL) {
 432				pr_err("gspca_frame_add() image == NULL\n");
 433				return;
 434			}
 435 */
 436			memcpy(gspca_dev->image + gspca_dev->image_len,
 437				data, len);
 438			gspca_dev->image_len += len;
 439		}
 440	}
 441	gspca_dev->last_packet_type = packet_type;
 442
 443	/* if last packet, invalidate packet concatenation until
 444	 * next first packet, wake up the application and advance
 445	 * in the queue */
 446	if (packet_type == LAST_PACKET) {
 447		if (gspca_dev->image_len > gspca_dev->pixfmt.sizeimage)
 448			gspca_dev->image_len = gspca_dev->pixfmt.sizeimage;
 449		spin_lock_irqsave(&gspca_dev->qlock, flags);
 450		list_del(&buf->list);
 451		spin_unlock_irqrestore(&gspca_dev->qlock, flags);
 452		buf->vb.vb2_buf.timestamp = ktime_get_ns();
 453		vb2_set_plane_payload(&buf->vb.vb2_buf, 0,
 454				      gspca_dev->image_len);
 455		buf->vb.sequence = gspca_dev->sequence++;
 456		buf->vb.field = V4L2_FIELD_NONE;
 457		gspca_dbg(gspca_dev, D_FRAM, "frame complete len:%d\n",
 458			  gspca_dev->image_len);
 459		vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_DONE);
 460		gspca_dev->image = NULL;
 461		gspca_dev->image_len = 0;
 462	}
 463}
 464EXPORT_SYMBOL(gspca_frame_add);
 465
 466static void destroy_urbs(struct gspca_dev *gspca_dev)
 467{
 468	struct urb *urb;
 469	unsigned int i;
 470
 471	gspca_dbg(gspca_dev, D_STREAM, "kill transfer\n");
 472
 473	/* Killing all URBs guarantee that no URB completion
 474	 * handler is running. Therefore, there shouldn't
 475	 * be anyone trying to access gspca_dev->urb[i]
 476	 */
 477	for (i = 0; i < MAX_NURBS; i++)
 478		usb_kill_urb(gspca_dev->urb[i]);
 479
 480	gspca_dbg(gspca_dev, D_STREAM, "releasing urbs\n");
 481	for (i = 0; i < MAX_NURBS; i++) {
 482		urb = gspca_dev->urb[i];
 483		if (!urb)
 484			continue;
 485		gspca_dev->urb[i] = NULL;
 486		usb_free_coherent(gspca_dev->dev,
 487				  urb->transfer_buffer_length,
 488				  urb->transfer_buffer,
 489				  urb->transfer_dma);
 490		usb_free_urb(urb);
 491	}
 492}
 493
 494static int gspca_set_alt0(struct gspca_dev *gspca_dev)
 495{
 496	int ret;
 497
 498	if (gspca_dev->alt == 0)
 499		return 0;
 500	ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, 0);
 501	if (ret < 0)
 502		pr_err("set alt 0 err %d\n", ret);
 503	return ret;
 504}
 505
 506/*
 507 * look for an input transfer endpoint in an alternate setting.
 508 *
 509 * If xfer_ep is invalid, return the first valid ep found, otherwise
 510 * look for exactly the ep with address equal to xfer_ep.
 511 */
 512static struct usb_host_endpoint *alt_xfer(struct usb_host_interface *alt,
 513					  int xfer, int xfer_ep)
 514{
 515	struct usb_host_endpoint *ep;
 516	int i, attr;
 517
 518	for (i = 0; i < alt->desc.bNumEndpoints; i++) {
 519		ep = &alt->endpoint[i];
 520		attr = ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
 521		if (attr == xfer
 522		    && ep->desc.wMaxPacketSize != 0
 523		    && usb_endpoint_dir_in(&ep->desc)
 524		    && (xfer_ep < 0 || ep->desc.bEndpointAddress == xfer_ep))
 525			return ep;
 526	}
 527	return NULL;
 528}
 529
 530/* compute the minimum bandwidth for the current transfer */
 531static u32 which_bandwidth(struct gspca_dev *gspca_dev)
 532{
 533	u32 bandwidth;
 534
 535	/* get the (max) image size */
 536	bandwidth = gspca_dev->pixfmt.sizeimage;
 537
 538	/* if the image is compressed, estimate its mean size */
 539	if (!gspca_dev->cam.needs_full_bandwidth &&
 540	    bandwidth < gspca_dev->pixfmt.width *
 541				gspca_dev->pixfmt.height)
 542		bandwidth = bandwidth * 3 / 8;	/* 0.375 */
 543
 544	/* estimate the frame rate */
 545	if (gspca_dev->sd_desc->get_streamparm) {
 546		struct v4l2_streamparm parm;
 547
 548		gspca_dev->sd_desc->get_streamparm(gspca_dev, &parm);
 549		bandwidth *= parm.parm.capture.timeperframe.denominator;
 550		bandwidth /= parm.parm.capture.timeperframe.numerator;
 551	} else {
 552
 553		/* don't hope more than 15 fps with USB 1.1 and
 554		 * image resolution >= 640x480 */
 555		if (gspca_dev->pixfmt.width >= 640
 556		 && gspca_dev->dev->speed == USB_SPEED_FULL)
 557			bandwidth *= 15;		/* 15 fps */
 558		else
 559			bandwidth *= 30;		/* 30 fps */
 560	}
 561
 562	gspca_dbg(gspca_dev, D_STREAM, "min bandwidth: %d\n", bandwidth);
 563	return bandwidth;
 564}
 565
 566/* endpoint table */
 567#define MAX_ALT 16
 568struct ep_tb_s {
 569	u32 alt;
 570	u32 bandwidth;
 571};
 572
 573/*
 574 * build the table of the endpoints
 575 * and compute the minimum bandwidth for the image transfer
 576 */
 577static int build_isoc_ep_tb(struct gspca_dev *gspca_dev,
 578			struct usb_interface *intf,
 579			struct ep_tb_s *ep_tb)
 580{
 581	struct usb_host_endpoint *ep;
 582	int i, j, nbalt, psize, found;
 583	u32 bandwidth, last_bw;
 584
 585	nbalt = intf->num_altsetting;
 586	if (nbalt > MAX_ALT)
 587		nbalt = MAX_ALT;	/* fixme: should warn */
 588
 589	/* build the endpoint table */
 590	i = 0;
 591	last_bw = 0;
 592	for (;;) {
 593		ep_tb->bandwidth = 2000 * 2000 * 120;
 594		found = 0;
 595		for (j = 0; j < nbalt; j++) {
 596			ep = alt_xfer(&intf->altsetting[j],
 597				      USB_ENDPOINT_XFER_ISOC,
 598				      gspca_dev->xfer_ep);
 599			if (ep == NULL)
 600				continue;
 601			if (ep->desc.bInterval == 0) {
 602				pr_err("alt %d iso endp with 0 interval\n", j);
 603				continue;
 604			}
 605			psize = le16_to_cpu(ep->desc.wMaxPacketSize);
 606			psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
 607			bandwidth = psize * 1000;
 608			if (gspca_dev->dev->speed == USB_SPEED_HIGH
 609			 || gspca_dev->dev->speed >= USB_SPEED_SUPER)
 610				bandwidth *= 8;
 611			bandwidth /= 1 << (ep->desc.bInterval - 1);
 612			if (bandwidth <= last_bw)
 613				continue;
 614			if (bandwidth < ep_tb->bandwidth) {
 615				ep_tb->bandwidth = bandwidth;
 616				ep_tb->alt = j;
 617				found = 1;
 618			}
 619		}
 620		if (!found)
 621			break;
 622		gspca_dbg(gspca_dev, D_STREAM, "alt %d bandwidth %d\n",
 623			  ep_tb->alt, ep_tb->bandwidth);
 624		last_bw = ep_tb->bandwidth;
 625		i++;
 626		ep_tb++;
 627	}
 628
 629	/*
 630	 * If the camera:
 631	 * has a usb audio class interface (a built in usb mic); and
 632	 * is a usb 1 full speed device; and
 633	 * uses the max full speed iso bandwidth; and
 634	 * and has more than 1 alt setting
 635	 * then skip the highest alt setting to spare bandwidth for the mic
 636	 */
 637	if (gspca_dev->audio &&
 638			gspca_dev->dev->speed == USB_SPEED_FULL &&
 639			last_bw >= 1000000 &&
 640			i > 1) {
 641		gspca_dbg(gspca_dev, D_STREAM, "dev has usb audio, skipping highest alt\n");
 642		i--;
 643		ep_tb--;
 644	}
 645
 646	/* get the requested bandwidth and start at the highest atlsetting */
 647	bandwidth = which_bandwidth(gspca_dev);
 648	ep_tb--;
 649	while (i > 1) {
 650		ep_tb--;
 651		if (ep_tb->bandwidth < bandwidth)
 652			break;
 653		i--;
 654	}
 655	return i;
 656}
 657
 658/*
 659 * create the URBs for image transfer
 660 */
 661static int create_urbs(struct gspca_dev *gspca_dev,
 662			struct usb_host_endpoint *ep)
 663{
 664	struct urb *urb;
 665	int n, nurbs, i, psize, npkt, bsize;
 666
 667	/* calculate the packet size and the number of packets */
 668	psize = le16_to_cpu(ep->desc.wMaxPacketSize);
 669
 670	if (!gspca_dev->cam.bulk) {		/* isoc */
 671
 672		/* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */
 673		if (gspca_dev->pkt_size == 0)
 674			psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
 675		else
 676			psize = gspca_dev->pkt_size;
 677		npkt = gspca_dev->cam.npkt;
 678		if (npkt == 0)
 679			npkt = 32;		/* default value */
 680		bsize = psize * npkt;
 681		gspca_dbg(gspca_dev, D_STREAM,
 682			  "isoc %d pkts size %d = bsize:%d\n",
 683			  npkt, psize, bsize);
 684		nurbs = DEF_NURBS;
 685	} else {				/* bulk */
 686		npkt = 0;
 687		bsize = gspca_dev->cam.bulk_size;
 688		if (bsize == 0)
 689			bsize = psize;
 690		gspca_dbg(gspca_dev, D_STREAM, "bulk bsize:%d\n", bsize);
 691		if (gspca_dev->cam.bulk_nurbs != 0)
 692			nurbs = gspca_dev->cam.bulk_nurbs;
 693		else
 694			nurbs = 1;
 695	}
 696
 697	for (n = 0; n < nurbs; n++) {
 698		urb = usb_alloc_urb(npkt, GFP_KERNEL);
 699		if (!urb)
 700			return -ENOMEM;
 701		gspca_dev->urb[n] = urb;
 702		urb->transfer_buffer = usb_alloc_coherent(gspca_dev->dev,
 703						bsize,
 704						GFP_KERNEL,
 705						&urb->transfer_dma);
 706
 707		if (urb->transfer_buffer == NULL) {
 708			pr_err("usb_alloc_coherent failed\n");
 709			return -ENOMEM;
 710		}
 711		urb->dev = gspca_dev->dev;
 712		urb->context = gspca_dev;
 713		urb->transfer_buffer_length = bsize;
 714		if (npkt != 0) {		/* ISOC */
 715			urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
 716						    ep->desc.bEndpointAddress);
 717			urb->transfer_flags = URB_ISO_ASAP
 718					| URB_NO_TRANSFER_DMA_MAP;
 719			urb->interval = 1 << (ep->desc.bInterval - 1);
 720			urb->complete = isoc_irq;
 721			urb->number_of_packets = npkt;
 722			for (i = 0; i < npkt; i++) {
 723				urb->iso_frame_desc[i].length = psize;
 724				urb->iso_frame_desc[i].offset = psize * i;
 725			}
 726		} else {		/* bulk */
 727			urb->pipe = usb_rcvbulkpipe(gspca_dev->dev,
 728						ep->desc.bEndpointAddress);
 729			urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
 730			urb->complete = bulk_irq;
 731		}
 732	}
 733	return 0;
 734}
 735
 736/* Note: both the queue and the usb locks should be held when calling this */
 737static void gspca_stream_off(struct gspca_dev *gspca_dev)
 738{
 739	gspca_dev->streaming = false;
 740	gspca_dev->usb_err = 0;
 741	if (gspca_dev->sd_desc->stopN)
 742		gspca_dev->sd_desc->stopN(gspca_dev);
 743	destroy_urbs(gspca_dev);
 744	gspca_input_destroy_urb(gspca_dev);
 745	gspca_set_alt0(gspca_dev);
 746	if (gspca_dev->present)
 747		gspca_input_create_urb(gspca_dev);
 748	if (gspca_dev->sd_desc->stop0)
 749		gspca_dev->sd_desc->stop0(gspca_dev);
 750	gspca_dbg(gspca_dev, D_STREAM, "stream off OK\n");
 751}
 752
 753/*
 754 * start the USB transfer
 755 */
 756static int gspca_init_transfer(struct gspca_dev *gspca_dev)
 757{
 758	struct usb_interface *intf;
 759	struct usb_host_endpoint *ep;
 760	struct urb *urb;
 761	struct ep_tb_s ep_tb[MAX_ALT];
 762	int n, ret, xfer, alt, alt_idx;
 763
 764	/* reset the streaming variables */
 765	gspca_dev->image = NULL;
 766	gspca_dev->image_len = 0;
 767	gspca_dev->last_packet_type = DISCARD_PACKET;
 768
 769	gspca_dev->usb_err = 0;
 770
 771	/* do the specific subdriver stuff before endpoint selection */
 772	intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
 773	gspca_dev->alt = gspca_dev->cam.bulk ? intf->num_altsetting : 0;
 774	if (gspca_dev->sd_desc->isoc_init) {
 775		ret = gspca_dev->sd_desc->isoc_init(gspca_dev);
 776		if (ret < 0)
 777			return ret;
 778	}
 779	xfer = gspca_dev->cam.bulk ? USB_ENDPOINT_XFER_BULK
 780				   : USB_ENDPOINT_XFER_ISOC;
 781
 782	/* if bulk or the subdriver forced an altsetting, get the endpoint */
 783	if (gspca_dev->alt != 0) {
 784		gspca_dev->alt--;	/* (previous version compatibility) */
 785		ep = alt_xfer(&intf->altsetting[gspca_dev->alt], xfer,
 786			      gspca_dev->xfer_ep);
 787		if (ep == NULL) {
 788			pr_err("bad altsetting %d\n", gspca_dev->alt);
 789			return -EIO;
 790		}
 791		ep_tb[0].alt = gspca_dev->alt;
 792		alt_idx = 1;
 793	} else {
 794		/* else, compute the minimum bandwidth
 795		 * and build the endpoint table */
 796		alt_idx = build_isoc_ep_tb(gspca_dev, intf, ep_tb);
 797		if (alt_idx <= 0) {
 798			pr_err("no transfer endpoint found\n");
 799			return -EIO;
 800		}
 801	}
 802
 803	/* set the highest alternate setting and
 804	 * loop until urb submit succeeds */
 805	gspca_input_destroy_urb(gspca_dev);
 806
 807	gspca_dev->alt = ep_tb[--alt_idx].alt;
 808	alt = -1;
 809	for (;;) {
 810		if (alt != gspca_dev->alt) {
 811			alt = gspca_dev->alt;
 812			if (intf->num_altsetting > 1) {
 813				ret = usb_set_interface(gspca_dev->dev,
 814							gspca_dev->iface,
 815							alt);
 816				if (ret < 0) {
 817					if (ret == -ENOSPC)
 818						goto retry; /*fixme: ugly*/
 819					pr_err("set alt %d err %d\n", alt, ret);
 820					goto out;
 821				}
 822			}
 823		}
 824		if (!gspca_dev->cam.no_urb_create) {
 825			gspca_dbg(gspca_dev, D_STREAM, "init transfer alt %d\n",
 826				  alt);
 827			ret = create_urbs(gspca_dev,
 828				alt_xfer(&intf->altsetting[alt], xfer,
 829					 gspca_dev->xfer_ep));
 830			if (ret < 0) {
 831				destroy_urbs(gspca_dev);
 832				goto out;
 833			}
 834		}
 835
 836		/* clear the bulk endpoint */
 837		if (gspca_dev->cam.bulk)
 838			usb_clear_halt(gspca_dev->dev,
 839					gspca_dev->urb[0]->pipe);
 840
 841		/* start the cam */
 842		ret = gspca_dev->sd_desc->start(gspca_dev);
 843		if (ret < 0) {
 844			destroy_urbs(gspca_dev);
 845			goto out;
 846		}
 847		v4l2_ctrl_handler_setup(gspca_dev->vdev.ctrl_handler);
 848		gspca_dev->streaming = true;
 849
 850		/* some bulk transfers are started by the subdriver */
 851		if (gspca_dev->cam.bulk && gspca_dev->cam.bulk_nurbs == 0)
 852			break;
 853
 854		/* submit the URBs */
 855		for (n = 0; n < MAX_NURBS; n++) {
 856			urb = gspca_dev->urb[n];
 857			if (urb == NULL)
 858				break;
 859			ret = usb_submit_urb(urb, GFP_KERNEL);
 860			if (ret < 0)
 861				break;
 862		}
 863		if (ret >= 0)
 864			break;			/* transfer is started */
 865
 866		/* something when wrong
 867		 * stop the webcam and free the transfer resources */
 868		gspca_stream_off(gspca_dev);
 869		if (ret != -ENOSPC) {
 870			pr_err("usb_submit_urb alt %d err %d\n",
 871			       gspca_dev->alt, ret);
 872			goto out;
 873		}
 874
 875		/* the bandwidth is not wide enough
 876		 * negotiate or try a lower alternate setting */
 877retry:
 878		gspca_err(gspca_dev, "alt %d - bandwidth not wide enough, trying again\n",
 879			  alt);
 880		msleep(20);	/* wait for kill complete */
 881		if (gspca_dev->sd_desc->isoc_nego) {
 882			ret = gspca_dev->sd_desc->isoc_nego(gspca_dev);
 883			if (ret < 0)
 884				goto out;
 885		} else {
 886			if (alt_idx <= 0) {
 887				pr_err("no transfer endpoint found\n");
 888				ret = -EIO;
 889				goto out;
 890			}
 891			gspca_dev->alt = ep_tb[--alt_idx].alt;
 892		}
 893	}
 894out:
 895	gspca_input_create_urb(gspca_dev);
 896	return ret;
 897}
 898
 899static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
 900{
 901	int i;
 902
 903	i = gspca_dev->cam.nmodes - 1;	/* take the highest mode */
 904	gspca_dev->curr_mode = i;
 905	gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i];
 906
 907	/* does nothing if ctrl_handler == NULL */
 908	v4l2_ctrl_handler_setup(gspca_dev->vdev.ctrl_handler);
 909}
 910
 911static int wxh_to_mode(struct gspca_dev *gspca_dev,
 912			int width, int height, u32 pixelformat)
 913{
 914	int i;
 915
 916	for (i = 0; i < gspca_dev->cam.nmodes; i++) {
 917		if (width == gspca_dev->cam.cam_mode[i].width
 918		    && height == gspca_dev->cam.cam_mode[i].height
 919		    && pixelformat == gspca_dev->cam.cam_mode[i].pixelformat)
 920			return i;
 921	}
 922	return -EINVAL;
 923}
 924
 925static int wxh_to_nearest_mode(struct gspca_dev *gspca_dev,
 926			int width, int height, u32 pixelformat)
 927{
 928	int i;
 929
 930	for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
 931		if (width >= gspca_dev->cam.cam_mode[i].width
 932		    && height >= gspca_dev->cam.cam_mode[i].height
 933		    && pixelformat == gspca_dev->cam.cam_mode[i].pixelformat)
 934			return i;
 935	}
 936	for (i = gspca_dev->cam.nmodes; --i > 0; ) {
 937		if (width >= gspca_dev->cam.cam_mode[i].width
 938		    && height >= gspca_dev->cam.cam_mode[i].height)
 939			break;
 940	}
 941	return i;
 942}
 943
 944/*
 945 * search a mode with the right pixel format
 946 */
 947static int gspca_get_mode(struct gspca_dev *gspca_dev,
 948			int mode,
 949			int pixfmt)
 950{
 951	int modeU, modeD;
 952
 953	modeU = modeD = mode;
 954	while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) {
 955		if (--modeD >= 0) {
 956			if (gspca_dev->cam.cam_mode[modeD].pixelformat
 957								== pixfmt)
 958				return modeD;
 959		}
 960		if (++modeU < gspca_dev->cam.nmodes) {
 961			if (gspca_dev->cam.cam_mode[modeU].pixelformat
 962								== pixfmt)
 963				return modeU;
 964		}
 965	}
 966	return -EINVAL;
 967}
 968
 969#ifdef CONFIG_VIDEO_ADV_DEBUG
 970static int vidioc_g_chip_info(struct file *file, void *priv,
 971				struct v4l2_dbg_chip_info *chip)
 972{
 973	struct gspca_dev *gspca_dev = video_drvdata(file);
 974
 975	gspca_dev->usb_err = 0;
 976	if (gspca_dev->sd_desc->get_chip_info)
 977		return gspca_dev->sd_desc->get_chip_info(gspca_dev, chip);
 978	return chip->match.addr ? -EINVAL : 0;
 979}
 980
 981static int vidioc_g_register(struct file *file, void *priv,
 982		struct v4l2_dbg_register *reg)
 983{
 984	struct gspca_dev *gspca_dev = video_drvdata(file);
 985
 986	gspca_dev->usb_err = 0;
 987	return gspca_dev->sd_desc->get_register(gspca_dev, reg);
 988}
 989
 990static int vidioc_s_register(struct file *file, void *priv,
 991		const struct v4l2_dbg_register *reg)
 992{
 993	struct gspca_dev *gspca_dev = video_drvdata(file);
 994
 995	gspca_dev->usb_err = 0;
 996	return gspca_dev->sd_desc->set_register(gspca_dev, reg);
 997}
 998#endif
 999
1000static int vidioc_enum_fmt_vid_cap(struct file *file, void  *priv,
1001				struct v4l2_fmtdesc *fmtdesc)
1002{
1003	struct gspca_dev *gspca_dev = video_drvdata(file);
1004	int i, j, index;
1005	__u32 fmt_tb[8];
1006
1007	/* give an index to each format */
1008	index = 0;
1009	for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
1010		fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
1011		j = 0;
1012		for (;;) {
1013			if (fmt_tb[j] == fmt_tb[index])
1014				break;
1015			j++;
1016		}
1017		if (j == index) {
1018			if (fmtdesc->index == index)
1019				break;		/* new format */
1020			index++;
1021			if (index >= ARRAY_SIZE(fmt_tb))
1022				return -EINVAL;
1023		}
1024	}
1025	if (i < 0)
1026		return -EINVAL;		/* no more format */
1027
1028	fmtdesc->pixelformat = fmt_tb[index];
1029	return 0;
1030}
1031
1032static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
1033				struct v4l2_format *fmt)
1034{
1035	struct gspca_dev *gspca_dev = video_drvdata(file);
1036	u32 fmt_priv = fmt->fmt.pix.priv;
1037
1038	fmt->fmt.pix = gspca_dev->pixfmt;
1039	/* some drivers use priv internally, so keep the original value */
1040	fmt->fmt.pix.priv = fmt_priv;
1041	return 0;
1042}
1043
1044static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
1045			struct v4l2_format *fmt)
1046{
1047	int w, h, mode, mode2;
1048
1049	w = fmt->fmt.pix.width;
1050	h = fmt->fmt.pix.height;
1051
1052	PDEBUG_MODE(gspca_dev, D_CONF, "try fmt cap",
1053		    fmt->fmt.pix.pixelformat, w, h);
1054
1055	/* search the nearest mode for width and height */
1056	mode = wxh_to_nearest_mode(gspca_dev, w, h, fmt->fmt.pix.pixelformat);
1057
1058	/* OK if right palette */
1059	if (gspca_dev->cam.cam_mode[mode].pixelformat
1060						!= fmt->fmt.pix.pixelformat) {
1061
1062		/* else, search the closest mode with the same pixel format */
1063		mode2 = gspca_get_mode(gspca_dev, mode,
1064					fmt->fmt.pix.pixelformat);
1065		if (mode2 >= 0)
1066			mode = mode2;
1067	}
1068	fmt->fmt.pix = gspca_dev->cam.cam_mode[mode];
1069	if (gspca_dev->sd_desc->try_fmt) {
1070		/* pass original resolution to subdriver try_fmt */
1071		fmt->fmt.pix.width = w;
1072		fmt->fmt.pix.height = h;
1073		gspca_dev->sd_desc->try_fmt(gspca_dev, fmt);
1074	}
1075	return mode;			/* used when s_fmt */
1076}
1077
1078static int vidioc_try_fmt_vid_cap(struct file *file, void *priv,
1079				  struct v4l2_format *fmt)
1080{
1081	struct gspca_dev *gspca_dev = video_drvdata(file);
1082	u32 fmt_priv = fmt->fmt.pix.priv;
1083
1084	if (try_fmt_vid_cap(gspca_dev, fmt) < 0)
1085		return -EINVAL;
1086	/* some drivers use priv internally, so keep the original value */
1087	fmt->fmt.pix.priv = fmt_priv;
1088	return 0;
1089}
1090
1091static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
1092				struct v4l2_format *fmt)
1093{
1094	struct gspca_dev *gspca_dev = video_drvdata(file);
1095	u32 fmt_priv = fmt->fmt.pix.priv;
1096	int mode;
1097
1098	if (vb2_is_busy(&gspca_dev->queue))
1099		return -EBUSY;
1100
1101	mode = try_fmt_vid_cap(gspca_dev, fmt);
1102	if (mode < 0)
1103		return -EINVAL;
1104
1105	gspca_dev->curr_mode = mode;
1106	if (gspca_dev->sd_desc->try_fmt)
1107		/* subdriver try_fmt can modify format parameters */
1108		gspca_dev->pixfmt = fmt->fmt.pix;
1109	else
1110		gspca_dev->pixfmt = gspca_dev->cam.cam_mode[mode];
1111	/* some drivers use priv internally, so keep the original value */
1112	fmt->fmt.pix.priv = fmt_priv;
1113	return 0;
1114}
1115
1116static int vidioc_enum_framesizes(struct file *file, void *priv,
1117				  struct v4l2_frmsizeenum *fsize)
1118{
1119	struct gspca_dev *gspca_dev = video_drvdata(file);
1120	int i;
1121	__u32 index = 0;
1122
1123	if (gspca_dev->sd_desc->enum_framesizes)
1124		return gspca_dev->sd_desc->enum_framesizes(gspca_dev, fsize);
1125
1126	for (i = 0; i < gspca_dev->cam.nmodes; i++) {
1127		if (fsize->pixel_format !=
1128				gspca_dev->cam.cam_mode[i].pixelformat)
1129			continue;
1130
1131		if (fsize->index == index) {
1132			fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1133			fsize->discrete.width =
1134				gspca_dev->cam.cam_mode[i].width;
1135			fsize->discrete.height =
1136				gspca_dev->cam.cam_mode[i].height;
1137			return 0;
1138		}
1139		index++;
1140	}
1141
1142	return -EINVAL;
1143}
1144
1145static int vidioc_enum_frameintervals(struct file *filp, void *priv,
1146				      struct v4l2_frmivalenum *fival)
1147{
1148	struct gspca_dev *gspca_dev = video_drvdata(filp);
1149	int mode;
1150	__u32 i;
1151
1152	mode = wxh_to_mode(gspca_dev, fival->width, fival->height,
1153			   fival->pixel_format);
1154	if (mode < 0)
1155		return -EINVAL;
1156
1157	if (gspca_dev->cam.mode_framerates == NULL ||
1158			gspca_dev->cam.mode_framerates[mode].nrates == 0)
1159		return -EINVAL;
1160
1161	if (fival->pixel_format !=
1162			gspca_dev->cam.cam_mode[mode].pixelformat)
1163		return -EINVAL;
1164
1165	for (i = 0; i < gspca_dev->cam.mode_framerates[mode].nrates; i++) {
1166		if (fival->index == i) {
1167			fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
1168			fival->discrete.numerator = 1;
1169			fival->discrete.denominator =
1170				gspca_dev->cam.mode_framerates[mode].rates[i];
1171			return 0;
1172		}
1173	}
1174
1175	return -EINVAL;
1176}
1177
1178static void gspca_release(struct v4l2_device *v4l2_device)
1179{
1180	struct gspca_dev *gspca_dev =
1181		container_of(v4l2_device, struct gspca_dev, v4l2_dev);
1182
1183	v4l2_ctrl_handler_free(gspca_dev->vdev.ctrl_handler);
1184	v4l2_device_unregister(&gspca_dev->v4l2_dev);
1185	kfree(gspca_dev->usb_buf);
1186	kfree(gspca_dev);
1187}
1188
1189static int vidioc_querycap(struct file *file, void  *priv,
1190			   struct v4l2_capability *cap)
1191{
1192	struct gspca_dev *gspca_dev = video_drvdata(file);
1193
1194	strscpy((char *)cap->driver, gspca_dev->sd_desc->name,
1195		sizeof(cap->driver));
1196	if (gspca_dev->dev->product != NULL) {
1197		strscpy((char *)cap->card, gspca_dev->dev->product,
1198			sizeof(cap->card));
1199	} else {
1200		snprintf((char *) cap->card, sizeof cap->card,
1201			"USB Camera (%04x:%04x)",
1202			le16_to_cpu(gspca_dev->dev->descriptor.idVendor),
1203			le16_to_cpu(gspca_dev->dev->descriptor.idProduct));
1204	}
1205	usb_make_path(gspca_dev->dev, (char *) cap->bus_info,
1206			sizeof(cap->bus_info));
1207	return 0;
1208}
1209
1210static int vidioc_enum_input(struct file *file, void *priv,
1211				struct v4l2_input *input)
1212{
1213	struct gspca_dev *gspca_dev = video_drvdata(file);
1214
1215	if (input->index != 0)
1216		return -EINVAL;
1217	input->type = V4L2_INPUT_TYPE_CAMERA;
1218	input->status = gspca_dev->cam.input_flags;
1219	strscpy(input->name, gspca_dev->sd_desc->name,
1220		sizeof input->name);
1221	return 0;
1222}
1223
1224static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
1225{
1226	*i = 0;
1227	return 0;
1228}
1229
1230static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
1231{
1232	if (i > 0)
1233		return -EINVAL;
1234	return 0;
1235}
1236
1237static int vidioc_g_jpegcomp(struct file *file, void *priv,
1238			struct v4l2_jpegcompression *jpegcomp)
1239{
1240	struct gspca_dev *gspca_dev = video_drvdata(file);
1241
1242	gspca_dev->usb_err = 0;
1243	return gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
1244}
1245
1246static int vidioc_s_jpegcomp(struct file *file, void *priv,
1247			const struct v4l2_jpegcompression *jpegcomp)
1248{
1249	struct gspca_dev *gspca_dev = video_drvdata(file);
1250
1251	gspca_dev->usb_err = 0;
1252	return gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
1253}
1254
1255static int vidioc_g_parm(struct file *filp, void *priv,
1256			struct v4l2_streamparm *parm)
1257{
1258	struct gspca_dev *gspca_dev = video_drvdata(filp);
1259
1260	parm->parm.capture.readbuffers = gspca_dev->queue.min_queued_buffers;
1261
1262	if (!gspca_dev->sd_desc->get_streamparm)
1263		return 0;
1264
1265	parm->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
1266	gspca_dev->usb_err = 0;
1267	gspca_dev->sd_desc->get_streamparm(gspca_dev, parm);
1268	return gspca_dev->usb_err;
1269}
1270
1271static int vidioc_s_parm(struct file *filp, void *priv,
1272			struct v4l2_streamparm *parm)
1273{
1274	struct gspca_dev *gspca_dev = video_drvdata(filp);
1275
1276	parm->parm.capture.readbuffers = gspca_dev->queue.min_queued_buffers;
1277
1278	if (!gspca_dev->sd_desc->set_streamparm) {
1279		parm->parm.capture.capability = 0;
1280		return 0;
1281	}
1282
1283	parm->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
1284	gspca_dev->usb_err = 0;
1285	gspca_dev->sd_desc->set_streamparm(gspca_dev, parm);
1286	return gspca_dev->usb_err;
1287}
1288
1289static int gspca_queue_setup(struct vb2_queue *vq,
1290			     unsigned int *nbuffers, unsigned int *nplanes,
1291			     unsigned int sizes[], struct device *alloc_devs[])
1292{
1293	struct gspca_dev *gspca_dev = vb2_get_drv_priv(vq);
1294	unsigned int size = PAGE_ALIGN(gspca_dev->pixfmt.sizeimage);
1295
1296	if (*nplanes)
1297		return sizes[0] < size ? -EINVAL : 0;
1298	*nplanes = 1;
1299	sizes[0] = size;
1300	return 0;
1301}
1302
1303static int gspca_buffer_prepare(struct vb2_buffer *vb)
1304{
1305	struct gspca_dev *gspca_dev = vb2_get_drv_priv(vb->vb2_queue);
1306	unsigned long size = PAGE_ALIGN(gspca_dev->pixfmt.sizeimage);
1307
1308	if (vb2_plane_size(vb, 0) < size) {
1309		gspca_err(gspca_dev, "buffer too small (%lu < %lu)\n",
1310			 vb2_plane_size(vb, 0), size);
1311		return -EINVAL;
1312	}
1313	return 0;
1314}
1315
1316static void gspca_buffer_finish(struct vb2_buffer *vb)
1317{
1318	struct gspca_dev *gspca_dev = vb2_get_drv_priv(vb->vb2_queue);
1319
1320	if (!gspca_dev->sd_desc->dq_callback)
1321		return;
1322
1323	gspca_dev->usb_err = 0;
1324	if (gspca_dev->present)
1325		gspca_dev->sd_desc->dq_callback(gspca_dev);
1326}
1327
1328static void gspca_buffer_queue(struct vb2_buffer *vb)
1329{
1330	struct gspca_dev *gspca_dev = vb2_get_drv_priv(vb->vb2_queue);
1331	struct gspca_buffer *buf = to_gspca_buffer(vb);
1332	unsigned long flags;
1333
1334	spin_lock_irqsave(&gspca_dev->qlock, flags);
1335	list_add_tail(&buf->list, &gspca_dev->buf_list);
1336	spin_unlock_irqrestore(&gspca_dev->qlock, flags);
1337}
1338
1339static void gspca_return_all_buffers(struct gspca_dev *gspca_dev,
1340				     enum vb2_buffer_state state)
1341{
1342	struct gspca_buffer *buf, *node;
1343	unsigned long flags;
1344
1345	spin_lock_irqsave(&gspca_dev->qlock, flags);
1346	list_for_each_entry_safe(buf, node, &gspca_dev->buf_list, list) {
1347		vb2_buffer_done(&buf->vb.vb2_buf, state);
1348		list_del(&buf->list);
1349	}
1350	spin_unlock_irqrestore(&gspca_dev->qlock, flags);
1351}
1352
1353static int gspca_start_streaming(struct vb2_queue *vq, unsigned int count)
1354{
1355	struct gspca_dev *gspca_dev = vb2_get_drv_priv(vq);
1356	int ret;
1357
1358	gspca_dev->sequence = 0;
1359
1360	ret = gspca_init_transfer(gspca_dev);
1361	if (ret)
1362		gspca_return_all_buffers(gspca_dev, VB2_BUF_STATE_QUEUED);
1363	return ret;
1364}
1365
1366static void gspca_stop_streaming(struct vb2_queue *vq)
1367{
1368	struct gspca_dev *gspca_dev = vb2_get_drv_priv(vq);
1369
1370	gspca_stream_off(gspca_dev);
1371
1372	/* Release all active buffers */
1373	gspca_return_all_buffers(gspca_dev, VB2_BUF_STATE_ERROR);
1374}
1375
1376static const struct vb2_ops gspca_qops = {
1377	.queue_setup		= gspca_queue_setup,
1378	.buf_prepare		= gspca_buffer_prepare,
1379	.buf_finish		= gspca_buffer_finish,
1380	.buf_queue		= gspca_buffer_queue,
1381	.start_streaming	= gspca_start_streaming,
1382	.stop_streaming		= gspca_stop_streaming,
1383};
1384
1385static const struct v4l2_file_operations dev_fops = {
1386	.owner = THIS_MODULE,
1387	.open = v4l2_fh_open,
1388	.release = vb2_fop_release,
1389	.unlocked_ioctl = video_ioctl2,
1390	.read = vb2_fop_read,
1391	.mmap = vb2_fop_mmap,
1392	.poll = vb2_fop_poll,
1393};
1394
1395static const struct v4l2_ioctl_ops dev_ioctl_ops = {
1396	.vidioc_querycap	= vidioc_querycap,
1397	.vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
1398	.vidioc_try_fmt_vid_cap	= vidioc_try_fmt_vid_cap,
1399	.vidioc_g_fmt_vid_cap	= vidioc_g_fmt_vid_cap,
1400	.vidioc_s_fmt_vid_cap	= vidioc_s_fmt_vid_cap,
1401	.vidioc_enum_input	= vidioc_enum_input,
1402	.vidioc_g_input		= vidioc_g_input,
1403	.vidioc_s_input		= vidioc_s_input,
1404	.vidioc_g_jpegcomp	= vidioc_g_jpegcomp,
1405	.vidioc_s_jpegcomp	= vidioc_s_jpegcomp,
1406	.vidioc_g_parm		= vidioc_g_parm,
1407	.vidioc_s_parm		= vidioc_s_parm,
1408	.vidioc_enum_framesizes = vidioc_enum_framesizes,
1409	.vidioc_enum_frameintervals = vidioc_enum_frameintervals,
1410
1411	.vidioc_reqbufs		= vb2_ioctl_reqbufs,
1412	.vidioc_create_bufs	= vb2_ioctl_create_bufs,
1413	.vidioc_querybuf	= vb2_ioctl_querybuf,
1414	.vidioc_qbuf		= vb2_ioctl_qbuf,
1415	.vidioc_dqbuf		= vb2_ioctl_dqbuf,
1416	.vidioc_expbuf		= vb2_ioctl_expbuf,
1417	.vidioc_streamon	= vb2_ioctl_streamon,
1418	.vidioc_streamoff	= vb2_ioctl_streamoff,
1419
1420#ifdef CONFIG_VIDEO_ADV_DEBUG
1421	.vidioc_g_chip_info	= vidioc_g_chip_info,
1422	.vidioc_g_register	= vidioc_g_register,
1423	.vidioc_s_register	= vidioc_s_register,
1424#endif
1425	.vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
1426	.vidioc_unsubscribe_event = v4l2_event_unsubscribe,
1427};
1428
1429static const struct video_device gspca_template = {
1430	.name = "gspca main driver",
1431	.fops = &dev_fops,
1432	.ioctl_ops = &dev_ioctl_ops,
1433	.release = video_device_release_empty, /* We use v4l2_dev.release */
1434};
1435
1436/*
1437 * probe and create a new gspca device
1438 *
1439 * This function must be called by the sub-driver when it is
1440 * called for probing a new device.
1441 */
1442int gspca_dev_probe2(struct usb_interface *intf,
1443		const struct usb_device_id *id,
1444		const struct sd_desc *sd_desc,
1445		int dev_size,
1446		struct module *module)
1447{
1448	struct gspca_dev *gspca_dev;
1449	struct usb_device *dev = interface_to_usbdev(intf);
1450	struct vb2_queue *q;
1451	int ret;
1452
1453	pr_info("%s-" GSPCA_VERSION " probing %04x:%04x\n",
1454		sd_desc->name, id->idVendor, id->idProduct);
1455
1456	/* create the device */
1457	if (dev_size < sizeof *gspca_dev)
1458		dev_size = sizeof *gspca_dev;
1459	gspca_dev = kzalloc(dev_size, GFP_KERNEL);
1460	if (!gspca_dev) {
1461		pr_err("couldn't kzalloc gspca struct\n");
1462		return -ENOMEM;
1463	}
1464	gspca_dev->usb_buf = kzalloc(USB_BUF_SZ, GFP_KERNEL);
1465	if (!gspca_dev->usb_buf) {
1466		pr_err("out of memory\n");
1467		ret = -ENOMEM;
1468		goto out;
1469	}
1470	gspca_dev->dev = dev;
1471	gspca_dev->iface = intf->cur_altsetting->desc.bInterfaceNumber;
1472	gspca_dev->xfer_ep = -1;
1473
1474	/* check if any audio device */
1475	if (dev->actconfig->desc.bNumInterfaces != 1) {
1476		int i;
1477		struct usb_interface *intf2;
1478
1479		for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
1480			intf2 = dev->actconfig->interface[i];
1481			if (intf2 != NULL
1482			 && intf2->altsetting != NULL
1483			 && intf2->altsetting->desc.bInterfaceClass ==
1484					 USB_CLASS_AUDIO) {
1485				gspca_dev->audio = 1;
1486				break;
1487			}
1488		}
1489	}
1490
1491	gspca_dev->v4l2_dev.release = gspca_release;
1492	ret = v4l2_device_register(&intf->dev, &gspca_dev->v4l2_dev);
1493	if (ret)
1494		goto out;
1495	gspca_dev->present = true;
1496	gspca_dev->sd_desc = sd_desc;
1497	gspca_dev->empty_packet = -1;	/* don't check the empty packets */
1498	gspca_dev->vdev = gspca_template;
1499	gspca_dev->vdev.v4l2_dev = &gspca_dev->v4l2_dev;
1500	gspca_dev->vdev.device_caps = V4L2_CAP_VIDEO_CAPTURE |
1501				      V4L2_CAP_STREAMING | V4L2_CAP_READWRITE;
1502	video_set_drvdata(&gspca_dev->vdev, gspca_dev);
1503	gspca_dev->module = module;
1504
1505	mutex_init(&gspca_dev->usb_lock);
1506	gspca_dev->vdev.lock = &gspca_dev->usb_lock;
1507	init_waitqueue_head(&gspca_dev->wq);
1508
1509	/* Initialize the vb2 queue */
1510	q = &gspca_dev->queue;
1511	q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1512	q->io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF | VB2_READ;
1513	q->drv_priv = gspca_dev;
1514	q->buf_struct_size = sizeof(struct gspca_buffer);
1515	q->ops = &gspca_qops;
1516	q->mem_ops = &vb2_vmalloc_memops;
1517	q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
1518	q->min_queued_buffers = 2;
1519	q->lock = &gspca_dev->usb_lock;
1520	ret = vb2_queue_init(q);
1521	if (ret)
1522		goto out;
1523	gspca_dev->vdev.queue = q;
1524
1525	INIT_LIST_HEAD(&gspca_dev->buf_list);
1526	spin_lock_init(&gspca_dev->qlock);
1527
1528	/* configure the subdriver and initialize the USB device */
1529	ret = sd_desc->config(gspca_dev, id);
1530	if (ret < 0)
1531		goto out;
1532	ret = sd_desc->init(gspca_dev);
1533	if (ret < 0)
1534		goto out;
1535	if (sd_desc->init_controls)
1536		ret = sd_desc->init_controls(gspca_dev);
1537	if (ret < 0)
1538		goto out;
1539	gspca_set_default_mode(gspca_dev);
1540
1541	ret = gspca_input_connect(gspca_dev);
1542	if (ret)
1543		goto out;
1544
1545#ifdef CONFIG_VIDEO_ADV_DEBUG
1546	if (!gspca_dev->sd_desc->get_register)
1547		v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_DBG_G_REGISTER);
1548	if (!gspca_dev->sd_desc->set_register)
1549		v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_DBG_S_REGISTER);
1550#endif
1551	if (!gspca_dev->sd_desc->get_jcomp)
1552		v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_G_JPEGCOMP);
1553	if (!gspca_dev->sd_desc->set_jcomp)
1554		v4l2_disable_ioctl(&gspca_dev->vdev, VIDIOC_S_JPEGCOMP);
1555
1556	/* init video stuff */
1557	ret = video_register_device(&gspca_dev->vdev,
1558				  VFL_TYPE_VIDEO,
1559				  -1);
1560	if (ret < 0) {
1561		pr_err("video_register_device err %d\n", ret);
1562		goto out;
1563	}
1564
1565	usb_set_intfdata(intf, gspca_dev);
1566	gspca_dbg(gspca_dev, D_PROBE, "%s created\n",
1567		  video_device_node_name(&gspca_dev->vdev));
1568
1569	gspca_input_create_urb(gspca_dev);
1570
1571	return 0;
1572out:
1573#if IS_ENABLED(CONFIG_INPUT)
1574	if (gspca_dev->input_dev)
1575		input_unregister_device(gspca_dev->input_dev);
1576#endif
1577	v4l2_ctrl_handler_free(gspca_dev->vdev.ctrl_handler);
1578	v4l2_device_unregister(&gspca_dev->v4l2_dev);
1579	if (sd_desc->probe_error)
1580		sd_desc->probe_error(gspca_dev);
1581	kfree(gspca_dev->usb_buf);
1582	kfree(gspca_dev);
1583	return ret;
1584}
1585EXPORT_SYMBOL(gspca_dev_probe2);
1586
1587/* same function as the previous one, but check the interface */
1588int gspca_dev_probe(struct usb_interface *intf,
1589		const struct usb_device_id *id,
1590		const struct sd_desc *sd_desc,
1591		int dev_size,
1592		struct module *module)
1593{
1594	struct usb_device *dev = interface_to_usbdev(intf);
1595
1596	/* we don't handle multi-config cameras */
1597	if (dev->descriptor.bNumConfigurations != 1) {
1598		pr_err("%04x:%04x too many config\n",
1599		       id->idVendor, id->idProduct);
1600		return -ENODEV;
1601	}
1602
1603	/* the USB video interface must be the first one */
1604	if (dev->actconfig->desc.bNumInterfaces != 1
1605	 && intf->cur_altsetting->desc.bInterfaceNumber != 0)
1606		return -ENODEV;
1607
1608	return gspca_dev_probe2(intf, id, sd_desc, dev_size, module);
1609}
1610EXPORT_SYMBOL(gspca_dev_probe);
1611
1612/*
1613 * USB disconnection
1614 *
1615 * This function must be called by the sub-driver
1616 * when the device disconnects, after the specific resources are freed.
1617 */
1618void gspca_disconnect(struct usb_interface *intf)
1619{
1620	struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1621#if IS_ENABLED(CONFIG_INPUT)
1622	struct input_dev *input_dev;
1623#endif
1624
1625	gspca_dbg(gspca_dev, D_PROBE, "%s disconnect\n",
1626		  video_device_node_name(&gspca_dev->vdev));
1627
1628	mutex_lock(&gspca_dev->usb_lock);
1629	gspca_dev->present = false;
1630	destroy_urbs(gspca_dev);
1631	gspca_input_destroy_urb(gspca_dev);
1632
1633	vb2_queue_error(&gspca_dev->queue);
1634
1635#if IS_ENABLED(CONFIG_INPUT)
1636	input_dev = gspca_dev->input_dev;
1637	if (input_dev) {
1638		gspca_dev->input_dev = NULL;
1639		input_unregister_device(input_dev);
1640	}
1641#endif
1642
1643	v4l2_device_disconnect(&gspca_dev->v4l2_dev);
1644	video_unregister_device(&gspca_dev->vdev);
1645
1646	mutex_unlock(&gspca_dev->usb_lock);
1647
1648	/* (this will call gspca_release() immediately or on last close) */
1649	v4l2_device_put(&gspca_dev->v4l2_dev);
1650}
1651EXPORT_SYMBOL(gspca_disconnect);
1652
1653#ifdef CONFIG_PM
1654int gspca_suspend(struct usb_interface *intf, pm_message_t message)
1655{
1656	struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1657
1658	gspca_input_destroy_urb(gspca_dev);
1659
1660	if (!vb2_start_streaming_called(&gspca_dev->queue))
1661		return 0;
1662
1663	mutex_lock(&gspca_dev->usb_lock);
1664	gspca_dev->frozen = 1;		/* avoid urb error messages */
1665	gspca_dev->usb_err = 0;
1666	if (gspca_dev->sd_desc->stopN)
1667		gspca_dev->sd_desc->stopN(gspca_dev);
1668	destroy_urbs(gspca_dev);
1669	gspca_set_alt0(gspca_dev);
1670	if (gspca_dev->sd_desc->stop0)
1671		gspca_dev->sd_desc->stop0(gspca_dev);
1672	mutex_unlock(&gspca_dev->usb_lock);
1673
1674	return 0;
1675}
1676EXPORT_SYMBOL(gspca_suspend);
1677
1678int gspca_resume(struct usb_interface *intf)
1679{
1680	struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1681	int streaming, ret = 0;
1682
1683	mutex_lock(&gspca_dev->usb_lock);
1684	gspca_dev->frozen = 0;
1685	gspca_dev->usb_err = 0;
1686	gspca_dev->sd_desc->init(gspca_dev);
1687	/*
1688	 * Most subdrivers send all ctrl values on sd_start and thus
1689	 * only write to the device registers on s_ctrl when streaming ->
1690	 * Clear streaming to avoid setting all ctrls twice.
1691	 */
1692	streaming = vb2_start_streaming_called(&gspca_dev->queue);
1693	if (streaming)
1694		ret = gspca_init_transfer(gspca_dev);
1695	else
1696		gspca_input_create_urb(gspca_dev);
1697	mutex_unlock(&gspca_dev->usb_lock);
1698
1699	return ret;
1700}
1701EXPORT_SYMBOL(gspca_resume);
1702#endif
1703
1704/* -- module insert / remove -- */
1705static int __init gspca_init(void)
1706{
1707	pr_info("v" GSPCA_VERSION " registered\n");
1708	return 0;
1709}
1710static void __exit gspca_exit(void)
1711{
1712}
1713
1714module_init(gspca_init);
1715module_exit(gspca_exit);
1716
1717module_param_named(debug, gspca_debug, int, 0644);
1718MODULE_PARM_DESC(debug,
1719		"1:probe 2:config 3:stream 4:frame 5:packet 6:usbi 7:usbo");