1/* 2 * uvc_v4l2.c -- USB Video Class Gadget driver 3 * 4 * Copyright (C) 2009-2010 5 * Laurent Pinchart (laurent.pinchart@ideasonboard.com) 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 11 * 12 */ 13 14#include <linux/kernel.h> 15#include <linux/device.h> 16#include <linux/errno.h> 17#include <linux/list.h> 18#include <linux/mutex.h> 19#include <linux/version.h> 20#include <linux/videodev2.h> 21#include <linux/vmalloc.h> 22#include <linux/wait.h> 23 24#include <media/v4l2-dev.h> 25#include <media/v4l2-event.h> 26#include <media/v4l2-ioctl.h> 27 28#include "uvc.h" 29#include "uvc_queue.h" 30 31/* -------------------------------------------------------------------------- 32 * Requests handling 33 */ 34 35static int 36uvc_send_response(struct uvc_device *uvc, struct uvc_request_data *data) 37{ 38 struct usb_composite_dev *cdev = uvc->func.config->cdev; 39 struct usb_request *req = uvc->control_req; 40 41 if (data->length < 0) 42 return usb_ep_set_halt(cdev->gadget->ep0); 43 44 req->length = min(uvc->event_length, data->length); 45 req->zero = data->length < uvc->event_length; 46 req->dma = DMA_ADDR_INVALID; 47 48 memcpy(req->buf, data->data, data->length); 49 50 return usb_ep_queue(cdev->gadget->ep0, req, GFP_KERNEL); 51} 52 53/* -------------------------------------------------------------------------- 54 * V4L2 55 */ 56 57struct uvc_format 58{ 59 u8 bpp; 60 u32 fcc; 61}; 62 63static struct uvc_format uvc_formats[] = { 64 { 16, V4L2_PIX_FMT_YUYV }, 65 { 0, V4L2_PIX_FMT_MJPEG }, 66}; 67 68static int 69uvc_v4l2_get_format(struct uvc_video *video, struct v4l2_format *fmt) 70{ 71 fmt->fmt.pix.pixelformat = video->fcc; 72 fmt->fmt.pix.width = video->width; 73 fmt->fmt.pix.height = video->height; 74 fmt->fmt.pix.field = V4L2_FIELD_NONE; 75 fmt->fmt.pix.bytesperline = video->bpp * video->width / 8; 76 fmt->fmt.pix.sizeimage = video->imagesize; 77 fmt->fmt.pix.colorspace = V4L2_COLORSPACE_SRGB; 78 fmt->fmt.pix.priv = 0; 79 80 return 0; 81} 82 83static int 84uvc_v4l2_set_format(struct uvc_video *video, struct v4l2_format *fmt) 85{ 86 struct uvc_format *format; 87 unsigned int imagesize; 88 unsigned int bpl; 89 unsigned int i; 90 91 for (i = 0; i < ARRAY_SIZE(uvc_formats); ++i) { 92 format = &uvc_formats[i]; 93 if (format->fcc == fmt->fmt.pix.pixelformat) 94 break; 95 } 96 97 if (i == ARRAY_SIZE(uvc_formats)) { 98 printk(KERN_INFO "Unsupported format 0x%08x.\n", 99 fmt->fmt.pix.pixelformat); 100 return -EINVAL; 101 } 102 103 bpl = format->bpp * fmt->fmt.pix.width / 8; 104 imagesize = bpl ? bpl * fmt->fmt.pix.height : fmt->fmt.pix.sizeimage; 105 106 video->fcc = format->fcc; 107 video->bpp = format->bpp; 108 video->width = fmt->fmt.pix.width; 109 video->height = fmt->fmt.pix.height; 110 video->imagesize = imagesize; 111 112 fmt->fmt.pix.field = V4L2_FIELD_NONE; 113 fmt->fmt.pix.bytesperline = bpl; 114 fmt->fmt.pix.sizeimage = imagesize; 115 fmt->fmt.pix.colorspace = V4L2_COLORSPACE_SRGB; 116 fmt->fmt.pix.priv = 0; 117 118 return 0; 119} 120 121static int 122uvc_v4l2_open(struct file *file) 123{ 124 struct video_device *vdev = video_devdata(file); 125 struct uvc_device *uvc = video_get_drvdata(vdev); 126 struct uvc_file_handle *handle; 127 int ret; 128 129 handle = kzalloc(sizeof(*handle), GFP_KERNEL); 130 if (handle == NULL) 131 return -ENOMEM; 132 133 ret = v4l2_fh_init(&handle->vfh, vdev); 134 if (ret < 0) 135 goto error; 136 137 ret = v4l2_event_init(&handle->vfh); 138 if (ret < 0) 139 goto error; 140 141 ret = v4l2_event_alloc(&handle->vfh, 8); 142 if (ret < 0) 143 goto error; 144 145 v4l2_fh_add(&handle->vfh); 146 147 handle->device = &uvc->video; 148 file->private_data = &handle->vfh; 149 150 uvc_function_connect(uvc); 151 return 0; 152 153error: 154 v4l2_fh_exit(&handle->vfh); 155 return ret; 156} 157 158static int 159uvc_v4l2_release(struct file *file) 160{ 161 struct video_device *vdev = video_devdata(file); 162 struct uvc_device *uvc = video_get_drvdata(vdev); 163 struct uvc_file_handle *handle = to_uvc_file_handle(file->private_data); 164 struct uvc_video *video = handle->device; 165 166 uvc_function_disconnect(uvc); 167 168 uvc_video_enable(video, 0); 169 mutex_lock(&video->queue.mutex); 170 if (uvc_free_buffers(&video->queue) < 0) 171 printk(KERN_ERR "uvc_v4l2_release: Unable to free " 172 "buffers.\n"); 173 mutex_unlock(&video->queue.mutex); 174 175 file->private_data = NULL; 176 v4l2_fh_del(&handle->vfh); 177 v4l2_fh_exit(&handle->vfh); 178 kfree(handle); 179 return 0; 180} 181 182static long 183uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg) 184{ 185 struct video_device *vdev = video_devdata(file); 186 struct uvc_device *uvc = video_get_drvdata(vdev); 187 struct uvc_file_handle *handle = to_uvc_file_handle(file->private_data); 188 struct usb_composite_dev *cdev = uvc->func.config->cdev; 189 struct uvc_video *video = &uvc->video; 190 int ret = 0; 191 192 switch (cmd) { 193 /* Query capabilities */ 194 case VIDIOC_QUERYCAP: 195 { 196 struct v4l2_capability *cap = arg; 197 198 memset(cap, 0, sizeof *cap); 199 strncpy(cap->driver, "g_uvc", sizeof(cap->driver)); 200 strncpy(cap->card, cdev->gadget->name, sizeof(cap->card)); 201 strncpy(cap->bus_info, dev_name(&cdev->gadget->dev), 202 sizeof cap->bus_info); 203 cap->version = DRIVER_VERSION_NUMBER; 204 cap->capabilities = V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_STREAMING; 205 break; 206 } 207 208 /* Get & Set format */ 209 case VIDIOC_G_FMT: 210 { 211 struct v4l2_format *fmt = arg; 212 213 if (fmt->type != video->queue.type) 214 return -EINVAL; 215 216 return uvc_v4l2_get_format(video, fmt); 217 } 218 219 case VIDIOC_S_FMT: 220 { 221 struct v4l2_format *fmt = arg; 222 223 if (fmt->type != video->queue.type) 224 return -EINVAL; 225 226 return uvc_v4l2_set_format(video, fmt); 227 } 228 229 /* Buffers & streaming */ 230 case VIDIOC_REQBUFS: 231 { 232 struct v4l2_requestbuffers *rb = arg; 233 234 if (rb->type != video->queue.type || 235 rb->memory != V4L2_MEMORY_MMAP) 236 return -EINVAL; 237 238 ret = uvc_alloc_buffers(&video->queue, rb->count, 239 video->imagesize); 240 if (ret < 0) 241 return ret; 242 243 rb->count = ret; 244 ret = 0; 245 break; 246 } 247 248 case VIDIOC_QUERYBUF: 249 { 250 struct v4l2_buffer *buf = arg; 251 252 if (buf->type != video->queue.type) 253 return -EINVAL; 254 255 return uvc_query_buffer(&video->queue, buf); 256 } 257 258 case VIDIOC_QBUF: 259 if ((ret = uvc_queue_buffer(&video->queue, arg)) < 0) 260 return ret; 261 262 return uvc_video_pump(video); 263 264 case VIDIOC_DQBUF: 265 return uvc_dequeue_buffer(&video->queue, arg, 266 file->f_flags & O_NONBLOCK); 267 268 case VIDIOC_STREAMON: 269 { 270 int *type = arg; 271 272 if (*type != video->queue.type) 273 return -EINVAL; 274 275 return uvc_video_enable(video, 1); 276 } 277 278 case VIDIOC_STREAMOFF: 279 { 280 int *type = arg; 281 282 if (*type != video->queue.type) 283 return -EINVAL; 284 285 return uvc_video_enable(video, 0); 286 } 287 288 /* Events */ 289 case VIDIOC_DQEVENT: 290 { 291 struct v4l2_event *event = arg; 292 293 ret = v4l2_event_dequeue(&handle->vfh, event, 294 file->f_flags & O_NONBLOCK); 295 if (ret == 0 && event->type == UVC_EVENT_SETUP) { 296 struct uvc_event *uvc_event = (void *)&event->u.data; 297 298 /* Tell the complete callback to generate an event for 299 * the next request that will be enqueued by 300 * uvc_event_write. 301 */ 302 uvc->event_setup_out = 303 !(uvc_event->req.bRequestType & USB_DIR_IN); 304 uvc->event_length = uvc_event->req.wLength; 305 } 306 307 return ret; 308 } 309 310 case VIDIOC_SUBSCRIBE_EVENT: 311 { 312 struct v4l2_event_subscription *sub = arg; 313 314 if (sub->type < UVC_EVENT_FIRST || sub->type > UVC_EVENT_LAST) 315 return -EINVAL; 316 317 return v4l2_event_subscribe(&handle->vfh, arg); 318 } 319 320 case VIDIOC_UNSUBSCRIBE_EVENT: 321 return v4l2_event_unsubscribe(&handle->vfh, arg); 322 323 case UVCIOC_SEND_RESPONSE: 324 ret = uvc_send_response(uvc, arg); 325 break; 326 327 default: 328 return -ENOIOCTLCMD; 329 } 330 331 return ret; 332} 333 334static long 335uvc_v4l2_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 336{ 337 return video_usercopy(file, cmd, arg, uvc_v4l2_do_ioctl); 338} 339 340static int 341uvc_v4l2_mmap(struct file *file, struct vm_area_struct *vma) 342{ 343 struct video_device *vdev = video_devdata(file); 344 struct uvc_device *uvc = video_get_drvdata(vdev); 345 346 return uvc_queue_mmap(&uvc->video.queue, vma); 347} 348 349static unsigned int 350uvc_v4l2_poll(struct file *file, poll_table *wait) 351{ 352 struct video_device *vdev = video_devdata(file); 353 struct uvc_device *uvc = video_get_drvdata(vdev); 354 struct uvc_file_handle *handle = to_uvc_file_handle(file->private_data); 355 unsigned int mask = 0; 356 357 poll_wait(file, &handle->vfh.events->wait, wait); 358 if (v4l2_event_pending(&handle->vfh)) 359 mask |= POLLPRI; 360 361 mask |= uvc_queue_poll(&uvc->video.queue, file, wait); 362 363 return mask; 364} 365 366static struct v4l2_file_operations uvc_v4l2_fops = { 367 .owner = THIS_MODULE, 368 .open = uvc_v4l2_open, 369 .release = uvc_v4l2_release, 370 .ioctl = uvc_v4l2_ioctl, 371 .mmap = uvc_v4l2_mmap, 372 .poll = uvc_v4l2_poll, 373}; 374