Linux 5.4-rc4
[sfrench/cifs-2.6.git] / drivers / media / usb / gspca / 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
45 MODULE_AUTHOR("Jean-François Moine <http://moinejf.free.fr>");
46 MODULE_DESCRIPTION("GSPCA USB Camera Driver");
47 MODULE_LICENSE("GPL");
48 MODULE_VERSION(GSPCA_VERSION);
49
50 int gspca_debug;
51 EXPORT_SYMBOL(gspca_debug);
52
53 static 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)
80 static 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
117 static 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
154 static 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
197 error_submit:
198         usb_free_coherent(dev,
199                           urb->transfer_buffer_length,
200                           urb->transfer_buffer,
201                           urb->transfer_dma);
202 error_buffer:
203         usb_free_urb(urb);
204 error:
205         return ret;
206 }
207
208 static 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
230 static 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
246 static inline void gspca_input_destroy_urb(struct gspca_dev *gspca_dev)
247 {
248 }
249
250 static inline void gspca_input_create_urb(struct gspca_dev *gspca_dev)
251 {
252 }
253
254 static 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  */
263 static 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
307 resubmit:
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  */
321 static 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  */
334 static 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
362 resubmit:
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  */
384 void 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                 spin_lock_irqsave(&gspca_dev->qlock, flags);
448                 list_del(&buf->list);
449                 spin_unlock_irqrestore(&gspca_dev->qlock, flags);
450                 buf->vb.vb2_buf.timestamp = ktime_get_ns();
451                 vb2_set_plane_payload(&buf->vb.vb2_buf, 0,
452                                       gspca_dev->image_len);
453                 buf->vb.sequence = gspca_dev->sequence++;
454                 buf->vb.field = V4L2_FIELD_NONE;
455                 gspca_dbg(gspca_dev, D_FRAM, "frame complete len:%d\n",
456                           gspca_dev->image_len);
457                 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_DONE);
458                 gspca_dev->image = NULL;
459                 gspca_dev->image_len = 0;
460         }
461 }
462 EXPORT_SYMBOL(gspca_frame_add);
463
464 static void destroy_urbs(struct gspca_dev *gspca_dev)
465 {
466         struct urb *urb;
467         unsigned int i;
468
469         gspca_dbg(gspca_dev, D_STREAM, "kill transfer\n");
470
471         /* Killing all URBs guarantee that no URB completion
472          * handler is running. Therefore, there shouldn't
473          * be anyone trying to access gspca_dev->urb[i]
474          */
475         for (i = 0; i < MAX_NURBS; i++)
476                 usb_kill_urb(gspca_dev->urb[i]);
477
478         gspca_dbg(gspca_dev, D_STREAM, "releasing urbs\n");
479         for (i = 0; i < MAX_NURBS; i++) {
480                 urb = gspca_dev->urb[i];
481                 if (!urb)
482                         continue;
483                 gspca_dev->urb[i] = NULL;
484                 usb_free_coherent(gspca_dev->dev,
485                                   urb->transfer_buffer_length,
486                                   urb->transfer_buffer,
487                                   urb->transfer_dma);
488                 usb_free_urb(urb);
489         }
490 }
491
492 static int gspca_set_alt0(struct gspca_dev *gspca_dev)
493 {
494         int ret;
495
496         if (gspca_dev->alt == 0)
497                 return 0;
498         ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, 0);
499         if (ret < 0)
500                 pr_err("set alt 0 err %d\n", ret);
501         return ret;
502 }
503
504 /*
505  * look for an input transfer endpoint in an alternate setting.
506  *
507  * If xfer_ep is invalid, return the first valid ep found, otherwise
508  * look for exactly the ep with address equal to xfer_ep.
509  */
510 static struct usb_host_endpoint *alt_xfer(struct usb_host_interface *alt,
511                                           int xfer, int xfer_ep)
512 {
513         struct usb_host_endpoint *ep;
514         int i, attr;
515
516         for (i = 0; i < alt->desc.bNumEndpoints; i++) {
517                 ep = &alt->endpoint[i];
518                 attr = ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
519                 if (attr == xfer
520                     && ep->desc.wMaxPacketSize != 0
521                     && usb_endpoint_dir_in(&ep->desc)
522                     && (xfer_ep < 0 || ep->desc.bEndpointAddress == xfer_ep))
523                         return ep;
524         }
525         return NULL;
526 }
527
528 /* compute the minimum bandwidth for the current transfer */
529 static u32 which_bandwidth(struct gspca_dev *gspca_dev)
530 {
531         u32 bandwidth;
532
533         /* get the (max) image size */
534         bandwidth = gspca_dev->pixfmt.sizeimage;
535
536         /* if the image is compressed, estimate its mean size */
537         if (!gspca_dev->cam.needs_full_bandwidth &&
538             bandwidth < gspca_dev->pixfmt.width *
539                                 gspca_dev->pixfmt.height)
540                 bandwidth = bandwidth * 3 / 8;  /* 0.375 */
541
542         /* estimate the frame rate */
543         if (gspca_dev->sd_desc->get_streamparm) {
544                 struct v4l2_streamparm parm;
545
546                 gspca_dev->sd_desc->get_streamparm(gspca_dev, &parm);
547                 bandwidth *= parm.parm.capture.timeperframe.denominator;
548                 bandwidth /= parm.parm.capture.timeperframe.numerator;
549         } else {
550
551                 /* don't hope more than 15 fps with USB 1.1 and
552                  * image resolution >= 640x480 */
553                 if (gspca_dev->pixfmt.width >= 640
554                  && gspca_dev->dev->speed == USB_SPEED_FULL)
555                         bandwidth *= 15;                /* 15 fps */
556                 else
557                         bandwidth *= 30;                /* 30 fps */
558         }
559
560         gspca_dbg(gspca_dev, D_STREAM, "min bandwidth: %d\n", bandwidth);
561         return bandwidth;
562 }
563
564 /* endpoint table */
565 #define MAX_ALT 16
566 struct ep_tb_s {
567         u32 alt;
568         u32 bandwidth;
569 };
570
571 /*
572  * build the table of the endpoints
573  * and compute the minimum bandwidth for the image transfer
574  */
575 static int build_isoc_ep_tb(struct gspca_dev *gspca_dev,
576                         struct usb_interface *intf,
577                         struct ep_tb_s *ep_tb)
578 {
579         struct usb_host_endpoint *ep;
580         int i, j, nbalt, psize, found;
581         u32 bandwidth, last_bw;
582
583         nbalt = intf->num_altsetting;
584         if (nbalt > MAX_ALT)
585                 nbalt = MAX_ALT;        /* fixme: should warn */
586
587         /* build the endpoint table */
588         i = 0;
589         last_bw = 0;
590         for (;;) {
591                 ep_tb->bandwidth = 2000 * 2000 * 120;
592                 found = 0;
593                 for (j = 0; j < nbalt; j++) {
594                         ep = alt_xfer(&intf->altsetting[j],
595                                       USB_ENDPOINT_XFER_ISOC,
596                                       gspca_dev->xfer_ep);
597                         if (ep == NULL)
598                                 continue;
599                         if (ep->desc.bInterval == 0) {
600                                 pr_err("alt %d iso endp with 0 interval\n", j);
601                                 continue;
602                         }
603                         psize = le16_to_cpu(ep->desc.wMaxPacketSize);
604                         psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
605                         bandwidth = psize * 1000;
606                         if (gspca_dev->dev->speed == USB_SPEED_HIGH
607                          || gspca_dev->dev->speed >= USB_SPEED_SUPER)
608                                 bandwidth *= 8;
609                         bandwidth /= 1 << (ep->desc.bInterval - 1);
610                         if (bandwidth <= last_bw)
611                                 continue;
612                         if (bandwidth < ep_tb->bandwidth) {
613                                 ep_tb->bandwidth = bandwidth;
614                                 ep_tb->alt = j;
615                                 found = 1;
616                         }
617                 }
618                 if (!found)
619                         break;
620                 gspca_dbg(gspca_dev, D_STREAM, "alt %d bandwidth %d\n",
621                           ep_tb->alt, ep_tb->bandwidth);
622                 last_bw = ep_tb->bandwidth;
623                 i++;
624                 ep_tb++;
625         }
626
627         /*
628          * If the camera:
629          * has a usb audio class interface (a built in usb mic); and
630          * is a usb 1 full speed device; and
631          * uses the max full speed iso bandwidth; and
632          * and has more than 1 alt setting
633          * then skip the highest alt setting to spare bandwidth for the mic
634          */
635         if (gspca_dev->audio &&
636                         gspca_dev->dev->speed == USB_SPEED_FULL &&
637                         last_bw >= 1000000 &&
638                         i > 1) {
639                 gspca_dbg(gspca_dev, D_STREAM, "dev has usb audio, skipping highest alt\n");
640                 i--;
641                 ep_tb--;
642         }
643
644         /* get the requested bandwidth and start at the highest atlsetting */
645         bandwidth = which_bandwidth(gspca_dev);
646         ep_tb--;
647         while (i > 1) {
648                 ep_tb--;
649                 if (ep_tb->bandwidth < bandwidth)
650                         break;
651                 i--;
652         }
653         return i;
654 }
655
656 /*
657  * create the URBs for image transfer
658  */
659 static int create_urbs(struct gspca_dev *gspca_dev,
660                         struct usb_host_endpoint *ep)
661 {
662         struct urb *urb;
663         int n, nurbs, i, psize, npkt, bsize;
664
665         /* calculate the packet size and the number of packets */
666         psize = le16_to_cpu(ep->desc.wMaxPacketSize);
667
668         if (!gspca_dev->cam.bulk) {             /* isoc */
669
670                 /* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */
671                 if (gspca_dev->pkt_size == 0)
672                         psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
673                 else
674                         psize = gspca_dev->pkt_size;
675                 npkt = gspca_dev->cam.npkt;
676                 if (npkt == 0)
677                         npkt = 32;              /* default value */
678                 bsize = psize * npkt;
679                 gspca_dbg(gspca_dev, D_STREAM,
680                           "isoc %d pkts size %d = bsize:%d\n",
681                           npkt, psize, bsize);
682                 nurbs = DEF_NURBS;
683         } else {                                /* bulk */
684                 npkt = 0;
685                 bsize = gspca_dev->cam.bulk_size;
686                 if (bsize == 0)
687                         bsize = psize;
688                 gspca_dbg(gspca_dev, D_STREAM, "bulk bsize:%d\n", bsize);
689                 if (gspca_dev->cam.bulk_nurbs != 0)
690                         nurbs = gspca_dev->cam.bulk_nurbs;
691                 else
692                         nurbs = 1;
693         }
694
695         for (n = 0; n < nurbs; n++) {
696                 urb = usb_alloc_urb(npkt, GFP_KERNEL);
697                 if (!urb)
698                         return -ENOMEM;
699                 gspca_dev->urb[n] = urb;
700                 urb->transfer_buffer = usb_alloc_coherent(gspca_dev->dev,
701                                                 bsize,
702                                                 GFP_KERNEL,
703                                                 &urb->transfer_dma);
704
705                 if (urb->transfer_buffer == NULL) {
706                         pr_err("usb_alloc_coherent failed\n");
707                         return -ENOMEM;
708                 }
709                 urb->dev = gspca_dev->dev;
710                 urb->context = gspca_dev;
711                 urb->transfer_buffer_length = bsize;
712                 if (npkt != 0) {                /* ISOC */
713                         urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
714                                                     ep->desc.bEndpointAddress);
715                         urb->transfer_flags = URB_ISO_ASAP
716                                         | URB_NO_TRANSFER_DMA_MAP;
717                         urb->interval = 1 << (ep->desc.bInterval - 1);
718                         urb->complete = isoc_irq;
719                         urb->number_of_packets = npkt;
720                         for (i = 0; i < npkt; i++) {
721                                 urb->iso_frame_desc[i].length = psize;
722                                 urb->iso_frame_desc[i].offset = psize * i;
723                         }
724                 } else {                /* bulk */
725                         urb->pipe = usb_rcvbulkpipe(gspca_dev->dev,
726                                                 ep->desc.bEndpointAddress);
727                         urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
728                         urb->complete = bulk_irq;
729                 }
730         }
731         return 0;
732 }
733
734 /* Note: both the queue and the usb locks should be held when calling this */
735 static void gspca_stream_off(struct gspca_dev *gspca_dev)
736 {
737         gspca_dev->streaming = false;
738         gspca_dev->usb_err = 0;
739         if (gspca_dev->sd_desc->stopN)
740                 gspca_dev->sd_desc->stopN(gspca_dev);
741         destroy_urbs(gspca_dev);
742         gspca_input_destroy_urb(gspca_dev);
743         gspca_set_alt0(gspca_dev);
744         if (gspca_dev->present)
745                 gspca_input_create_urb(gspca_dev);
746         if (gspca_dev->sd_desc->stop0)
747                 gspca_dev->sd_desc->stop0(gspca_dev);
748         gspca_dbg(gspca_dev, D_STREAM, "stream off OK\n");
749 }
750
751 /*
752  * start the USB transfer
753  */
754 static int gspca_init_transfer(struct gspca_dev *gspca_dev)
755 {
756         struct usb_interface *intf;
757         struct usb_host_endpoint *ep;
758         struct urb *urb;
759         struct ep_tb_s ep_tb[MAX_ALT];
760         int n, ret, xfer, alt, alt_idx;
761
762         /* reset the streaming variables */
763         gspca_dev->image = NULL;
764         gspca_dev->image_len = 0;
765         gspca_dev->last_packet_type = DISCARD_PACKET;
766
767         gspca_dev->usb_err = 0;
768
769         /* do the specific subdriver stuff before endpoint selection */
770         intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
771         gspca_dev->alt = gspca_dev->cam.bulk ? intf->num_altsetting : 0;
772         if (gspca_dev->sd_desc->isoc_init) {
773                 ret = gspca_dev->sd_desc->isoc_init(gspca_dev);
774                 if (ret < 0)
775                         return ret;
776         }
777         xfer = gspca_dev->cam.bulk ? USB_ENDPOINT_XFER_BULK
778                                    : USB_ENDPOINT_XFER_ISOC;
779
780         /* if bulk or the subdriver forced an altsetting, get the endpoint */
781         if (gspca_dev->alt != 0) {
782                 gspca_dev->alt--;       /* (previous version compatibility) */
783                 ep = alt_xfer(&intf->altsetting[gspca_dev->alt], xfer,
784                               gspca_dev->xfer_ep);
785                 if (ep == NULL) {
786                         pr_err("bad altsetting %d\n", gspca_dev->alt);
787                         return -EIO;
788                 }
789                 ep_tb[0].alt = gspca_dev->alt;
790                 alt_idx = 1;
791         } else {
792                 /* else, compute the minimum bandwidth
793                  * and build the endpoint table */
794                 alt_idx = build_isoc_ep_tb(gspca_dev, intf, ep_tb);
795                 if (alt_idx <= 0) {
796                         pr_err("no transfer endpoint found\n");
797                         return -EIO;
798                 }
799         }
800
801         /* set the highest alternate setting and
802          * loop until urb submit succeeds */
803         gspca_input_destroy_urb(gspca_dev);
804
805         gspca_dev->alt = ep_tb[--alt_idx].alt;
806         alt = -1;
807         for (;;) {
808                 if (alt != gspca_dev->alt) {
809                         alt = gspca_dev->alt;
810                         if (intf->num_altsetting > 1) {
811                                 ret = usb_set_interface(gspca_dev->dev,
812                                                         gspca_dev->iface,
813                                                         alt);
814                                 if (ret < 0) {
815                                         if (ret == -ENOSPC)
816                                                 goto retry; /*fixme: ugly*/
817                                         pr_err("set alt %d err %d\n", alt, ret);
818                                         goto out;
819                                 }
820                         }
821                 }
822                 if (!gspca_dev->cam.no_urb_create) {
823                         gspca_dbg(gspca_dev, D_STREAM, "init transfer alt %d\n",
824                                   alt);
825                         ret = create_urbs(gspca_dev,
826                                 alt_xfer(&intf->altsetting[alt], xfer,
827                                          gspca_dev->xfer_ep));
828                         if (ret < 0) {
829                                 destroy_urbs(gspca_dev);
830                                 goto out;
831                         }
832                 }
833
834                 /* clear the bulk endpoint */
835                 if (gspca_dev->cam.bulk)
836                         usb_clear_halt(gspca_dev->dev,
837                                         gspca_dev->urb[0]->pipe);
838
839                 /* start the cam */
840                 ret = gspca_dev->sd_desc->start(gspca_dev);
841                 if (ret < 0) {
842                         destroy_urbs(gspca_dev);
843                         goto out;
844                 }
845                 v4l2_ctrl_handler_setup(gspca_dev->vdev.ctrl_handler);
846                 gspca_dev->streaming = true;
847
848                 /* some bulk transfers are started by the subdriver */
849                 if (gspca_dev->cam.bulk && gspca_dev->cam.bulk_nurbs == 0)
850                         break;
851
852                 /* submit the URBs */
853                 for (n = 0; n < MAX_NURBS; n++) {
854                         urb = gspca_dev->urb[n];
855                         if (urb == NULL)
856                                 break;
857                         ret = usb_submit_urb(urb, GFP_KERNEL);
858                         if (ret < 0)
859                                 break;
860                 }
861                 if (ret >= 0)
862                         break;                  /* transfer is started */
863
864                 /* something when wrong
865                  * stop the webcam and free the transfer resources */
866                 gspca_stream_off(gspca_dev);
867                 if (ret != -ENOSPC) {
868                         pr_err("usb_submit_urb alt %d err %d\n",
869                                gspca_dev->alt, ret);
870                         goto out;
871                 }
872
873                 /* the bandwidth is not wide enough
874                  * negotiate or try a lower alternate setting */
875 retry:
876                 gspca_err(gspca_dev, "alt %d - bandwidth not wide enough, trying again\n",
877                           alt);
878                 msleep(20);     /* wait for kill complete */
879                 if (gspca_dev->sd_desc->isoc_nego) {
880                         ret = gspca_dev->sd_desc->isoc_nego(gspca_dev);
881                         if (ret < 0)
882                                 goto out;
883                 } else {
884                         if (alt_idx <= 0) {
885                                 pr_err("no transfer endpoint found\n");
886                                 ret = -EIO;
887                                 goto out;
888                         }
889                         gspca_dev->alt = ep_tb[--alt_idx].alt;
890                 }
891         }
892 out:
893         gspca_input_create_urb(gspca_dev);
894         return ret;
895 }
896
897 static void gspca_set_default_mode(struct gspca_dev *gspca_dev)
898 {
899         int i;
900
901         i = gspca_dev->cam.nmodes - 1;  /* take the highest mode */
902         gspca_dev->curr_mode = i;
903         gspca_dev->pixfmt = gspca_dev->cam.cam_mode[i];
904
905         /* does nothing if ctrl_handler == NULL */
906         v4l2_ctrl_handler_setup(gspca_dev->vdev.ctrl_handler);
907 }
908
909 static int wxh_to_mode(struct gspca_dev *gspca_dev,
910                         int width, int height, u32 pixelformat)
911 {
912         int i;
913
914         for (i = 0; i < gspca_dev->cam.nmodes; i++) {
915                 if (width == gspca_dev->cam.cam_mode[i].width
916                     && height == gspca_dev->cam.cam_mode[i].height
917                     && pixelformat == gspca_dev->cam.cam_mode[i].pixelformat)
918                         return i;
919         }
920         return -EINVAL;
921 }
922
923 static int wxh_to_nearest_mode(struct gspca_dev *gspca_dev,
924                         int width, int height, u32 pixelformat)
925 {
926         int i;
927
928         for (i = gspca_dev->cam.nmodes; --i > 0; ) {
929                 if (width >= gspca_dev->cam.cam_mode[i].width
930                     && height >= gspca_dev->cam.cam_mode[i].height
931                     && pixelformat == gspca_dev->cam.cam_mode[i].pixelformat)
932                         return i;
933         }
934         for (i = gspca_dev->cam.nmodes; --i > 0; ) {
935                 if (width >= gspca_dev->cam.cam_mode[i].width
936                     && height >= gspca_dev->cam.cam_mode[i].height)
937                         break;
938         }
939         return i;
940 }
941
942 /*
943  * search a mode with the right pixel format
944  */
945 static int gspca_get_mode(struct gspca_dev *gspca_dev,
946                         int mode,
947                         int pixfmt)
948 {
949         int modeU, modeD;
950
951         modeU = modeD = mode;
952         while ((modeU < gspca_dev->cam.nmodes) || modeD >= 0) {
953                 if (--modeD >= 0) {
954                         if (gspca_dev->cam.cam_mode[modeD].pixelformat
955                                                                 == pixfmt)
956                                 return modeD;
957                 }
958                 if (++modeU < gspca_dev->cam.nmodes) {
959                         if (gspca_dev->cam.cam_mode[modeU].pixelformat
960                                                                 == pixfmt)
961                                 return modeU;
962                 }
963         }
964         return -EINVAL;
965 }
966
967 #ifdef CONFIG_VIDEO_ADV_DEBUG
968 static int vidioc_g_chip_info(struct file *file, void *priv,
969                                 struct v4l2_dbg_chip_info *chip)
970 {
971         struct gspca_dev *gspca_dev = video_drvdata(file);
972
973         gspca_dev->usb_err = 0;
974         if (gspca_dev->sd_desc->get_chip_info)
975                 return gspca_dev->sd_desc->get_chip_info(gspca_dev, chip);
976         return chip->match.addr ? -EINVAL : 0;
977 }
978
979 static int vidioc_g_register(struct file *file, void *priv,
980                 struct v4l2_dbg_register *reg)
981 {
982         struct gspca_dev *gspca_dev = video_drvdata(file);
983
984         gspca_dev->usb_err = 0;
985         return gspca_dev->sd_desc->get_register(gspca_dev, reg);
986 }
987
988 static int vidioc_s_register(struct file *file, void *priv,
989                 const struct v4l2_dbg_register *reg)
990 {
991         struct gspca_dev *gspca_dev = video_drvdata(file);
992
993         gspca_dev->usb_err = 0;
994         return gspca_dev->sd_desc->set_register(gspca_dev, reg);
995 }
996 #endif
997
998 static int vidioc_enum_fmt_vid_cap(struct file *file, void  *priv,
999                                 struct v4l2_fmtdesc *fmtdesc)
1000 {
1001         struct gspca_dev *gspca_dev = video_drvdata(file);
1002         int i, j, index;
1003         __u32 fmt_tb[8];
1004
1005         /* give an index to each format */
1006         index = 0;
1007         for (i = gspca_dev->cam.nmodes; --i >= 0; ) {
1008                 fmt_tb[index] = gspca_dev->cam.cam_mode[i].pixelformat;
1009                 j = 0;
1010                 for (;;) {
1011                         if (fmt_tb[j] == fmt_tb[index])
1012                                 break;
1013                         j++;
1014                 }
1015                 if (j == index) {
1016                         if (fmtdesc->index == index)
1017                                 break;          /* new format */
1018                         index++;
1019                         if (index >= ARRAY_SIZE(fmt_tb))
1020                                 return -EINVAL;
1021                 }
1022         }
1023         if (i < 0)
1024                 return -EINVAL;         /* no more format */
1025
1026         fmtdesc->pixelformat = fmt_tb[index];
1027         return 0;
1028 }
1029
1030 static int vidioc_g_fmt_vid_cap(struct file *file, void *_priv,
1031                                 struct v4l2_format *fmt)
1032 {
1033         struct gspca_dev *gspca_dev = video_drvdata(file);
1034         u32 priv = fmt->fmt.pix.priv;
1035
1036         fmt->fmt.pix = gspca_dev->pixfmt;
1037         /* some drivers use priv internally, so keep the original value */
1038         fmt->fmt.pix.priv = priv;
1039         return 0;
1040 }
1041
1042 static int try_fmt_vid_cap(struct gspca_dev *gspca_dev,
1043                         struct v4l2_format *fmt)
1044 {
1045         int w, h, mode, mode2;
1046
1047         w = fmt->fmt.pix.width;
1048         h = fmt->fmt.pix.height;
1049
1050         PDEBUG_MODE(gspca_dev, D_CONF, "try fmt cap",
1051                     fmt->fmt.pix.pixelformat, w, h);
1052
1053         /* search the nearest mode for width and height */
1054         mode = wxh_to_nearest_mode(gspca_dev, w, h, fmt->fmt.pix.pixelformat);
1055
1056         /* OK if right palette */
1057         if (gspca_dev->cam.cam_mode[mode].pixelformat
1058                                                 != fmt->fmt.pix.pixelformat) {
1059
1060                 /* else, search the closest mode with the same pixel format */
1061                 mode2 = gspca_get_mode(gspca_dev, mode,
1062                                         fmt->fmt.pix.pixelformat);
1063                 if (mode2 >= 0)
1064                         mode = mode2;
1065         }
1066         fmt->fmt.pix = gspca_dev->cam.cam_mode[mode];
1067         if (gspca_dev->sd_desc->try_fmt) {
1068                 /* pass original resolution to subdriver try_fmt */
1069                 fmt->fmt.pix.width = w;
1070                 fmt->fmt.pix.height = h;
1071                 gspca_dev->sd_desc->try_fmt(gspca_dev, fmt);
1072         }
1073         return mode;                    /* used when s_fmt */
1074 }
1075
1076 static int vidioc_try_fmt_vid_cap(struct file *file, void *_priv,
1077                                   struct v4l2_format *fmt)
1078 {
1079         struct gspca_dev *gspca_dev = video_drvdata(file);
1080         u32 priv = fmt->fmt.pix.priv;
1081
1082         if (try_fmt_vid_cap(gspca_dev, fmt) < 0)
1083                 return -EINVAL;
1084         /* some drivers use priv internally, so keep the original value */
1085         fmt->fmt.pix.priv = priv;
1086         return 0;
1087 }
1088
1089 static int vidioc_s_fmt_vid_cap(struct file *file, void *_priv,
1090                                 struct v4l2_format *fmt)
1091 {
1092         struct gspca_dev *gspca_dev = video_drvdata(file);
1093         u32 priv = fmt->fmt.pix.priv;
1094         int mode;
1095
1096         if (vb2_is_busy(&gspca_dev->queue))
1097                 return -EBUSY;
1098
1099         mode = try_fmt_vid_cap(gspca_dev, fmt);
1100         if (mode < 0)
1101                 return -EINVAL;
1102
1103         gspca_dev->curr_mode = mode;
1104         if (gspca_dev->sd_desc->try_fmt)
1105                 /* subdriver try_fmt can modify format parameters */
1106                 gspca_dev->pixfmt = fmt->fmt.pix;
1107         else
1108                 gspca_dev->pixfmt = gspca_dev->cam.cam_mode[mode];
1109         /* some drivers use priv internally, so keep the original value */
1110         fmt->fmt.pix.priv = priv;
1111         return 0;
1112 }
1113
1114 static int vidioc_enum_framesizes(struct file *file, void *priv,
1115                                   struct v4l2_frmsizeenum *fsize)
1116 {
1117         struct gspca_dev *gspca_dev = video_drvdata(file);
1118         int i;
1119         __u32 index = 0;
1120
1121         if (gspca_dev->sd_desc->enum_framesizes)
1122                 return gspca_dev->sd_desc->enum_framesizes(gspca_dev, fsize);
1123
1124         for (i = 0; i < gspca_dev->cam.nmodes; i++) {
1125                 if (fsize->pixel_format !=
1126                                 gspca_dev->cam.cam_mode[i].pixelformat)
1127                         continue;
1128
1129                 if (fsize->index == index) {
1130                         fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1131                         fsize->discrete.width =
1132                                 gspca_dev->cam.cam_mode[i].width;
1133                         fsize->discrete.height =
1134                                 gspca_dev->cam.cam_mode[i].height;
1135                         return 0;
1136                 }
1137                 index++;
1138         }
1139
1140         return -EINVAL;
1141 }
1142
1143 static int vidioc_enum_frameintervals(struct file *filp, void *priv,
1144                                       struct v4l2_frmivalenum *fival)
1145 {
1146         struct gspca_dev *gspca_dev = video_drvdata(filp);
1147         int mode;
1148         __u32 i;
1149
1150         mode = wxh_to_mode(gspca_dev, fival->width, fival->height,
1151                            fival->pixel_format);
1152         if (mode < 0)
1153                 return -EINVAL;
1154
1155         if (gspca_dev->cam.mode_framerates == NULL ||
1156                         gspca_dev->cam.mode_framerates[mode].nrates == 0)
1157                 return -EINVAL;
1158
1159         if (fival->pixel_format !=
1160                         gspca_dev->cam.cam_mode[mode].pixelformat)
1161                 return -EINVAL;
1162
1163         for (i = 0; i < gspca_dev->cam.mode_framerates[mode].nrates; i++) {
1164                 if (fival->index == i) {
1165                         fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
1166                         fival->discrete.numerator = 1;
1167                         fival->discrete.denominator =
1168                                 gspca_dev->cam.mode_framerates[mode].rates[i];
1169                         return 0;
1170                 }
1171         }
1172
1173         return -EINVAL;
1174 }
1175
1176 static void gspca_release(struct v4l2_device *v4l2_device)
1177 {
1178         struct gspca_dev *gspca_dev =
1179                 container_of(v4l2_device, struct gspca_dev, v4l2_dev);
1180
1181         v4l2_ctrl_handler_free(gspca_dev->vdev.ctrl_handler);
1182         v4l2_device_unregister(&gspca_dev->v4l2_dev);
1183         kfree(gspca_dev->usb_buf);
1184         kfree(gspca_dev);
1185 }
1186
1187 static int vidioc_querycap(struct file *file, void  *priv,
1188                            struct v4l2_capability *cap)
1189 {
1190         struct gspca_dev *gspca_dev = video_drvdata(file);
1191
1192         strscpy((char *)cap->driver, gspca_dev->sd_desc->name,
1193                 sizeof(cap->driver));
1194         if (gspca_dev->dev->product != NULL) {
1195                 strscpy((char *)cap->card, gspca_dev->dev->product,
1196                         sizeof(cap->card));
1197         } else {
1198                 snprintf((char *) cap->card, sizeof cap->card,
1199                         "USB Camera (%04x:%04x)",
1200                         le16_to_cpu(gspca_dev->dev->descriptor.idVendor),
1201                         le16_to_cpu(gspca_dev->dev->descriptor.idProduct));
1202         }
1203         usb_make_path(gspca_dev->dev, (char *) cap->bus_info,
1204                         sizeof(cap->bus_info));
1205         return 0;
1206 }
1207
1208 static int vidioc_enum_input(struct file *file, void *priv,
1209                                 struct v4l2_input *input)
1210 {
1211         struct gspca_dev *gspca_dev = video_drvdata(file);
1212
1213         if (input->index != 0)
1214                 return -EINVAL;
1215         input->type = V4L2_INPUT_TYPE_CAMERA;
1216         input->status = gspca_dev->cam.input_flags;
1217         strscpy(input->name, gspca_dev->sd_desc->name,
1218                 sizeof input->name);
1219         return 0;
1220 }
1221
1222 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
1223 {
1224         *i = 0;
1225         return 0;
1226 }
1227
1228 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
1229 {
1230         if (i > 0)
1231                 return -EINVAL;
1232         return 0;
1233 }
1234
1235 static int vidioc_g_jpegcomp(struct file *file, void *priv,
1236                         struct v4l2_jpegcompression *jpegcomp)
1237 {
1238         struct gspca_dev *gspca_dev = video_drvdata(file);
1239
1240         gspca_dev->usb_err = 0;
1241         return gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
1242 }
1243
1244 static int vidioc_s_jpegcomp(struct file *file, void *priv,
1245                         const struct v4l2_jpegcompression *jpegcomp)
1246 {
1247         struct gspca_dev *gspca_dev = video_drvdata(file);
1248
1249         gspca_dev->usb_err = 0;
1250         return gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
1251 }
1252
1253 static int vidioc_g_parm(struct file *filp, void *priv,
1254                         struct v4l2_streamparm *parm)
1255 {
1256         struct gspca_dev *gspca_dev = video_drvdata(filp);
1257
1258         parm->parm.capture.readbuffers = gspca_dev->queue.min_buffers_needed;
1259
1260         if (!gspca_dev->sd_desc->get_streamparm)
1261                 return 0;
1262
1263         parm->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
1264         gspca_dev->usb_err = 0;
1265         gspca_dev->sd_desc->get_streamparm(gspca_dev, parm);
1266         return gspca_dev->usb_err;
1267 }
1268
1269 static int vidioc_s_parm(struct file *filp, void *priv,
1270                         struct v4l2_streamparm *parm)
1271 {
1272         struct gspca_dev *gspca_dev = video_drvdata(filp);
1273
1274         parm->parm.capture.readbuffers = gspca_dev->queue.min_buffers_needed;
1275
1276         if (!gspca_dev->sd_desc->set_streamparm) {
1277                 parm->parm.capture.capability = 0;
1278                 return 0;
1279         }
1280
1281         parm->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
1282         gspca_dev->usb_err = 0;
1283         gspca_dev->sd_desc->set_streamparm(gspca_dev, parm);
1284         return gspca_dev->usb_err;
1285 }
1286
1287 static int gspca_queue_setup(struct vb2_queue *vq,
1288                              unsigned int *nbuffers, unsigned int *nplanes,
1289                              unsigned int sizes[], struct device *alloc_devs[])
1290 {
1291         struct gspca_dev *gspca_dev = vb2_get_drv_priv(vq);
1292         unsigned int size = PAGE_ALIGN(gspca_dev->pixfmt.sizeimage);
1293
1294         if (*nplanes)
1295                 return sizes[0] < size ? -EINVAL : 0;
1296         *nplanes = 1;
1297         sizes[0] = size;
1298         return 0;
1299 }
1300
1301 static int gspca_buffer_prepare(struct vb2_buffer *vb)
1302 {
1303         struct gspca_dev *gspca_dev = vb2_get_drv_priv(vb->vb2_queue);
1304         unsigned long size = PAGE_ALIGN(gspca_dev->pixfmt.sizeimage);
1305
1306         if (vb2_plane_size(vb, 0) < size) {
1307                 gspca_err(gspca_dev, "buffer too small (%lu < %lu)\n",
1308                          vb2_plane_size(vb, 0), size);
1309                 return -EINVAL;
1310         }
1311         return 0;
1312 }
1313
1314 static void gspca_buffer_finish(struct vb2_buffer *vb)
1315 {
1316         struct gspca_dev *gspca_dev = vb2_get_drv_priv(vb->vb2_queue);
1317
1318         if (!gspca_dev->sd_desc->dq_callback)
1319                 return;
1320
1321         gspca_dev->usb_err = 0;
1322         if (gspca_dev->present)
1323                 gspca_dev->sd_desc->dq_callback(gspca_dev);
1324 }
1325
1326 static void gspca_buffer_queue(struct vb2_buffer *vb)
1327 {
1328         struct gspca_dev *gspca_dev = vb2_get_drv_priv(vb->vb2_queue);
1329         struct gspca_buffer *buf = to_gspca_buffer(vb);
1330         unsigned long flags;
1331
1332         spin_lock_irqsave(&gspca_dev->qlock, flags);
1333         list_add_tail(&buf->list, &gspca_dev->buf_list);
1334         spin_unlock_irqrestore(&gspca_dev->qlock, flags);
1335 }
1336
1337 static void gspca_return_all_buffers(struct gspca_dev *gspca_dev,
1338                                      enum vb2_buffer_state state)
1339 {
1340         struct gspca_buffer *buf, *node;
1341         unsigned long flags;
1342
1343         spin_lock_irqsave(&gspca_dev->qlock, flags);
1344         list_for_each_entry_safe(buf, node, &gspca_dev->buf_list, list) {
1345                 vb2_buffer_done(&buf->vb.vb2_buf, state);
1346                 list_del(&buf->list);
1347         }
1348         spin_unlock_irqrestore(&gspca_dev->qlock, flags);
1349 }
1350
1351 static int gspca_start_streaming(struct vb2_queue *vq, unsigned int count)
1352 {
1353         struct gspca_dev *gspca_dev = vb2_get_drv_priv(vq);
1354         int ret;
1355
1356         gspca_dev->sequence = 0;
1357
1358         ret = gspca_init_transfer(gspca_dev);
1359         if (ret)
1360                 gspca_return_all_buffers(gspca_dev, VB2_BUF_STATE_QUEUED);
1361         return ret;
1362 }
1363
1364 static void gspca_stop_streaming(struct vb2_queue *vq)
1365 {
1366         struct gspca_dev *gspca_dev = vb2_get_drv_priv(vq);
1367
1368         gspca_stream_off(gspca_dev);
1369
1370         /* Release all active buffers */
1371         gspca_return_all_buffers(gspca_dev, VB2_BUF_STATE_ERROR);
1372 }
1373
1374 static const struct vb2_ops gspca_qops = {
1375         .queue_setup            = gspca_queue_setup,
1376         .buf_prepare            = gspca_buffer_prepare,
1377         .buf_finish             = gspca_buffer_finish,
1378         .buf_queue              = gspca_buffer_queue,
1379         .start_streaming        = gspca_start_streaming,
1380         .stop_streaming         = gspca_stop_streaming,
1381         .wait_prepare           = vb2_ops_wait_prepare,
1382         .wait_finish            = vb2_ops_wait_finish,
1383 };
1384
1385 static 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
1395 static 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
1429 static 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  */
1442 int 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 = kmalloc(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_buffers_needed = 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_GRABBER,
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;
1572 out:
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         kfree(gspca_dev->usb_buf);
1579         kfree(gspca_dev);
1580         return ret;
1581 }
1582 EXPORT_SYMBOL(gspca_dev_probe2);
1583
1584 /* same function as the previous one, but check the interface */
1585 int gspca_dev_probe(struct usb_interface *intf,
1586                 const struct usb_device_id *id,
1587                 const struct sd_desc *sd_desc,
1588                 int dev_size,
1589                 struct module *module)
1590 {
1591         struct usb_device *dev = interface_to_usbdev(intf);
1592
1593         /* we don't handle multi-config cameras */
1594         if (dev->descriptor.bNumConfigurations != 1) {
1595                 pr_err("%04x:%04x too many config\n",
1596                        id->idVendor, id->idProduct);
1597                 return -ENODEV;
1598         }
1599
1600         /* the USB video interface must be the first one */
1601         if (dev->actconfig->desc.bNumInterfaces != 1
1602          && intf->cur_altsetting->desc.bInterfaceNumber != 0)
1603                 return -ENODEV;
1604
1605         return gspca_dev_probe2(intf, id, sd_desc, dev_size, module);
1606 }
1607 EXPORT_SYMBOL(gspca_dev_probe);
1608
1609 /*
1610  * USB disconnection
1611  *
1612  * This function must be called by the sub-driver
1613  * when the device disconnects, after the specific resources are freed.
1614  */
1615 void gspca_disconnect(struct usb_interface *intf)
1616 {
1617         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1618 #if IS_ENABLED(CONFIG_INPUT)
1619         struct input_dev *input_dev;
1620 #endif
1621
1622         gspca_dbg(gspca_dev, D_PROBE, "%s disconnect\n",
1623                   video_device_node_name(&gspca_dev->vdev));
1624
1625         mutex_lock(&gspca_dev->usb_lock);
1626         gspca_dev->present = false;
1627         destroy_urbs(gspca_dev);
1628         gspca_input_destroy_urb(gspca_dev);
1629
1630         vb2_queue_error(&gspca_dev->queue);
1631
1632 #if IS_ENABLED(CONFIG_INPUT)
1633         input_dev = gspca_dev->input_dev;
1634         if (input_dev) {
1635                 gspca_dev->input_dev = NULL;
1636                 input_unregister_device(input_dev);
1637         }
1638 #endif
1639
1640         v4l2_device_disconnect(&gspca_dev->v4l2_dev);
1641         video_unregister_device(&gspca_dev->vdev);
1642
1643         mutex_unlock(&gspca_dev->usb_lock);
1644
1645         /* (this will call gspca_release() immediately or on last close) */
1646         v4l2_device_put(&gspca_dev->v4l2_dev);
1647 }
1648 EXPORT_SYMBOL(gspca_disconnect);
1649
1650 #ifdef CONFIG_PM
1651 int gspca_suspend(struct usb_interface *intf, pm_message_t message)
1652 {
1653         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1654
1655         gspca_input_destroy_urb(gspca_dev);
1656
1657         if (!vb2_start_streaming_called(&gspca_dev->queue))
1658                 return 0;
1659
1660         mutex_lock(&gspca_dev->usb_lock);
1661         gspca_dev->frozen = 1;          /* avoid urb error messages */
1662         gspca_dev->usb_err = 0;
1663         if (gspca_dev->sd_desc->stopN)
1664                 gspca_dev->sd_desc->stopN(gspca_dev);
1665         destroy_urbs(gspca_dev);
1666         gspca_set_alt0(gspca_dev);
1667         if (gspca_dev->sd_desc->stop0)
1668                 gspca_dev->sd_desc->stop0(gspca_dev);
1669         mutex_unlock(&gspca_dev->usb_lock);
1670
1671         return 0;
1672 }
1673 EXPORT_SYMBOL(gspca_suspend);
1674
1675 int gspca_resume(struct usb_interface *intf)
1676 {
1677         struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
1678         int streaming, ret = 0;
1679
1680         mutex_lock(&gspca_dev->usb_lock);
1681         gspca_dev->frozen = 0;
1682         gspca_dev->usb_err = 0;
1683         gspca_dev->sd_desc->init(gspca_dev);
1684         /*
1685          * Most subdrivers send all ctrl values on sd_start and thus
1686          * only write to the device registers on s_ctrl when streaming ->
1687          * Clear streaming to avoid setting all ctrls twice.
1688          */
1689         streaming = vb2_start_streaming_called(&gspca_dev->queue);
1690         if (streaming)
1691                 ret = gspca_init_transfer(gspca_dev);
1692         else
1693                 gspca_input_create_urb(gspca_dev);
1694         mutex_unlock(&gspca_dev->usb_lock);
1695
1696         return ret;
1697 }
1698 EXPORT_SYMBOL(gspca_resume);
1699 #endif
1700
1701 /* -- module insert / remove -- */
1702 static int __init gspca_init(void)
1703 {
1704         pr_info("v" GSPCA_VERSION " registered\n");
1705         return 0;
1706 }
1707 static void __exit gspca_exit(void)
1708 {
1709 }
1710
1711 module_init(gspca_init);
1712 module_exit(gspca_exit);
1713
1714 module_param_named(debug, gspca_debug, int, 0644);
1715 MODULE_PARM_DESC(debug,
1716                 "1:probe 2:config 3:stream 4:frame 5:packet 6:usbi 7:usbo");