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[media] staging: easycap: Split buffer and video urb allocation
When the device is probed, this driver allocates frame buffers, field buffers, isoc buffers and urbs. This patch just split this into separate functions, which helps clearing the currently gigantic probe function. Signed-off-by: Ezequiel Garcia <elezegarcia@gmail.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Ezequiel García
Mauro Carvalho Chehab
parent
ab019fd41d
commit
20c50af28a
@ -3045,6 +3045,203 @@ static int populate_inputset(struct easycap *peasycap)
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return 0;
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}
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static int alloc_framebuffers(struct easycap *peasycap)
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{
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int i, j;
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void *pbuf;
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JOM(4, "allocating %i frame buffers of size %li\n",
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FRAME_BUFFER_MANY, (long int)FRAME_BUFFER_SIZE);
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JOM(4, ".... each scattered over %li pages\n",
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FRAME_BUFFER_SIZE/PAGE_SIZE);
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for (i = 0; i < FRAME_BUFFER_MANY; i++) {
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for (j = 0; j < FRAME_BUFFER_SIZE/PAGE_SIZE; j++) {
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if (peasycap->frame_buffer[i][j].pgo)
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SAM("attempting to reallocate framebuffers\n");
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else {
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pbuf = (void *)__get_free_page(GFP_KERNEL);
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if (!pbuf) {
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SAM("ERROR: Could not allocate "
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"framebuffer %i page %i\n", i, j);
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return -ENOMEM;
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}
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peasycap->allocation_video_page += 1;
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peasycap->frame_buffer[i][j].pgo = pbuf;
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}
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peasycap->frame_buffer[i][j].pto =
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peasycap->frame_buffer[i][j].pgo;
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}
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}
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peasycap->frame_fill = 0;
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peasycap->frame_read = 0;
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JOM(4, "allocation of frame buffers done: %i pages\n", i*j);
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return 0;
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}
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static int alloc_fieldbuffers(struct easycap *peasycap)
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{
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int i, j;
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void *pbuf;
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JOM(4, "allocating %i field buffers of size %li\n",
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FIELD_BUFFER_MANY, (long int)FIELD_BUFFER_SIZE);
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JOM(4, ".... each scattered over %li pages\n",
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FIELD_BUFFER_SIZE/PAGE_SIZE);
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for (i = 0; i < FIELD_BUFFER_MANY; i++) {
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for (j = 0; j < FIELD_BUFFER_SIZE/PAGE_SIZE; j++) {
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if (peasycap->field_buffer[i][j].pgo) {
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SAM("ERROR: attempting to reallocate "
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"fieldbuffers\n");
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} else {
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pbuf = (void *) __get_free_page(GFP_KERNEL);
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if (!pbuf) {
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SAM("ERROR: Could not allocate "
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"fieldbuffer %i page %i\n", i, j);
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return -ENOMEM;
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}
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peasycap->allocation_video_page += 1;
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peasycap->field_buffer[i][j].pgo = pbuf;
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}
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peasycap->field_buffer[i][j].pto =
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peasycap->field_buffer[i][j].pgo;
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}
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/* TODO: Hardcoded 0x0200 meaning? */
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peasycap->field_buffer[i][0].kount = 0x0200;
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}
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peasycap->field_fill = 0;
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peasycap->field_page = 0;
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peasycap->field_read = 0;
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JOM(4, "allocation of field buffers done: %i pages\n", i*j);
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return 0;
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}
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static int alloc_isocbuffers(struct easycap *peasycap)
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{
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int i;
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void *pbuf;
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JOM(4, "allocating %i isoc video buffers of size %i\n",
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VIDEO_ISOC_BUFFER_MANY,
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peasycap->video_isoc_buffer_size);
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JOM(4, ".... each occupying contiguous memory pages\n");
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for (i = 0; i < VIDEO_ISOC_BUFFER_MANY; i++) {
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pbuf = (void *)__get_free_pages(GFP_KERNEL,
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VIDEO_ISOC_ORDER);
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if (!pbuf) {
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SAM("ERROR: Could not allocate isoc "
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"video buffer %i\n", i);
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return -ENOMEM;
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}
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peasycap->allocation_video_page += BIT(VIDEO_ISOC_ORDER);
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peasycap->video_isoc_buffer[i].pgo = pbuf;
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peasycap->video_isoc_buffer[i].pto =
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pbuf + peasycap->video_isoc_buffer_size;
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peasycap->video_isoc_buffer[i].kount = i;
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}
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JOM(4, "allocation of isoc video buffers done: %i pages\n",
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i * (0x01 << VIDEO_ISOC_ORDER));
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return 0;
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}
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static int create_video_urbs(struct easycap *peasycap)
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{
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struct urb *purb;
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struct data_urb *pdata_urb;
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int i, j;
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JOM(4, "allocating %i struct urb.\n", VIDEO_ISOC_BUFFER_MANY);
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JOM(4, "using %i=peasycap->video_isoc_framesperdesc\n",
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peasycap->video_isoc_framesperdesc);
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JOM(4, "using %i=peasycap->video_isoc_maxframesize\n",
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peasycap->video_isoc_maxframesize);
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JOM(4, "using %i=peasycap->video_isoc_buffer_sizen",
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peasycap->video_isoc_buffer_size);
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for (i = 0; i < VIDEO_ISOC_BUFFER_MANY; i++) {
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purb = usb_alloc_urb(peasycap->video_isoc_framesperdesc,
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GFP_KERNEL);
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if (!purb) {
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SAM("ERROR: usb_alloc_urb returned NULL for buffer "
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"%i\n", i);
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return -ENOMEM;
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}
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peasycap->allocation_video_urb += 1;
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pdata_urb = kzalloc(sizeof(struct data_urb), GFP_KERNEL);
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if (!pdata_urb) {
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SAM("ERROR: Could not allocate struct data_urb.\n");
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return -ENOMEM;
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}
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peasycap->allocation_video_struct +=
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sizeof(struct data_urb);
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pdata_urb->purb = purb;
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pdata_urb->isbuf = i;
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pdata_urb->length = 0;
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list_add_tail(&(pdata_urb->list_head),
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peasycap->purb_video_head);
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if (!i) {
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JOM(4, "initializing video urbs thus:\n");
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JOM(4, " purb->interval = 1;\n");
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JOM(4, " purb->dev = peasycap->pusb_device;\n");
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JOM(4, " purb->pipe = usb_rcvisocpipe"
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"(peasycap->pusb_device,%i);\n",
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peasycap->video_endpointnumber);
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JOM(4, " purb->transfer_flags = URB_ISO_ASAP;\n");
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JOM(4, " purb->transfer_buffer = peasycap->"
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"video_isoc_buffer[.].pgo;\n");
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JOM(4, " purb->transfer_buffer_length = %i;\n",
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peasycap->video_isoc_buffer_size);
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JOM(4, " purb->complete = easycap_complete;\n");
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JOM(4, " purb->context = peasycap;\n");
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JOM(4, " purb->start_frame = 0;\n");
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JOM(4, " purb->number_of_packets = %i;\n",
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peasycap->video_isoc_framesperdesc);
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JOM(4, " for (j = 0; j < %i; j++)\n",
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peasycap->video_isoc_framesperdesc);
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JOM(4, " {\n");
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JOM(4, " purb->iso_frame_desc[j].offset = j*%i;\n",
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peasycap->video_isoc_maxframesize);
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JOM(4, " purb->iso_frame_desc[j].length = %i;\n",
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peasycap->video_isoc_maxframesize);
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JOM(4, " }\n");
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}
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purb->interval = 1;
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purb->dev = peasycap->pusb_device;
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purb->pipe = usb_rcvisocpipe(peasycap->pusb_device,
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peasycap->video_endpointnumber);
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purb->transfer_flags = URB_ISO_ASAP;
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purb->transfer_buffer = peasycap->video_isoc_buffer[i].pgo;
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purb->transfer_buffer_length =
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peasycap->video_isoc_buffer_size;
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purb->complete = easycap_complete;
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purb->context = peasycap;
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purb->start_frame = 0;
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purb->number_of_packets = peasycap->video_isoc_framesperdesc;
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for (j = 0; j < peasycap->video_isoc_framesperdesc; j++) {
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purb->iso_frame_desc[j].offset =
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j * peasycap->video_isoc_maxframesize;
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purb->iso_frame_desc[j].length =
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peasycap->video_isoc_maxframesize;
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}
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}
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JOM(4, "allocation of %i struct urb done.\n", i);
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return 0;
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}
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static const struct v4l2_file_operations v4l2_fops = {
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.owner = THIS_MODULE,
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.open = easycap_open_noinode,
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@ -3067,7 +3264,7 @@ static int easycap_usb_probe(struct usb_interface *intf,
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struct urb *purb;
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struct easycap *peasycap;
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struct data_urb *pdata_urb;
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int i, j, k, m, rc;
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int i, j, k, rc;
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u8 bInterfaceNumber;
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u8 bInterfaceClass;
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u8 bInterfaceSubClass;
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@ -3416,173 +3613,23 @@ static int easycap_usb_probe(struct usb_interface *intf,
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*/
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INIT_LIST_HEAD(&(peasycap->urb_video_head));
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peasycap->purb_video_head = &(peasycap->urb_video_head);
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JOM(4, "allocating %i frame buffers of size %li\n",
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FRAME_BUFFER_MANY, (long int)FRAME_BUFFER_SIZE);
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JOM(4, ".... each scattered over %li pages\n",
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FRAME_BUFFER_SIZE/PAGE_SIZE);
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for (k = 0; k < FRAME_BUFFER_MANY; k++) {
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for (m = 0; m < FRAME_BUFFER_SIZE/PAGE_SIZE; m++) {
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if (peasycap->frame_buffer[k][m].pgo)
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SAM("attempting to reallocate frame "
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" buffers\n");
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else {
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pbuf = (void *)__get_free_page(GFP_KERNEL);
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if (!pbuf) {
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SAM("ERROR: Could not allocate frame "
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"buffer %i page %i\n", k, m);
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return -ENOMEM;
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}
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rc = alloc_framebuffers(peasycap);
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if (rc < 0)
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return rc;
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peasycap->allocation_video_page += 1;
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peasycap->frame_buffer[k][m].pgo = pbuf;
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}
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peasycap->frame_buffer[k][m].pto =
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peasycap->frame_buffer[k][m].pgo;
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}
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}
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rc = alloc_fieldbuffers(peasycap);
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if (rc < 0)
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return rc;
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peasycap->frame_fill = 0;
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peasycap->frame_read = 0;
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JOM(4, "allocation of frame buffers done: %i pages\n", k *
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m);
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JOM(4, "allocating %i field buffers of size %li\n",
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FIELD_BUFFER_MANY, (long int)FIELD_BUFFER_SIZE);
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JOM(4, ".... each scattered over %li pages\n",
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FIELD_BUFFER_SIZE/PAGE_SIZE);
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rc = alloc_isocbuffers(peasycap);
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if (rc < 0)
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return rc;
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for (k = 0; k < FIELD_BUFFER_MANY; k++) {
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for (m = 0; m < FIELD_BUFFER_SIZE/PAGE_SIZE; m++) {
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if (peasycap->field_buffer[k][m].pgo) {
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SAM("ERROR: attempting to reallocate "
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"field buffers\n");
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} else {
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pbuf = (void *) __get_free_page(GFP_KERNEL);
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if (!pbuf) {
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SAM("ERROR: Could not allocate field"
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" buffer %i page %i\n", k, m);
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return -ENOMEM;
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}
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peasycap->allocation_video_page += 1;
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peasycap->field_buffer[k][m].pgo = pbuf;
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}
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peasycap->field_buffer[k][m].pto =
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peasycap->field_buffer[k][m].pgo;
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}
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peasycap->field_buffer[k][0].kount = 0x0200;
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}
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peasycap->field_fill = 0;
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peasycap->field_page = 0;
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peasycap->field_read = 0;
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JOM(4, "allocation of field buffers done: %i pages\n", k *
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m);
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JOM(4, "allocating %i isoc video buffers of size %i\n",
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VIDEO_ISOC_BUFFER_MANY,
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peasycap->video_isoc_buffer_size);
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JOM(4, ".... each occupying contiguous memory pages\n");
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for (k = 0; k < VIDEO_ISOC_BUFFER_MANY; k++) {
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pbuf = (void *)__get_free_pages(GFP_KERNEL,
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VIDEO_ISOC_ORDER);
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if (!pbuf) {
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SAM("ERROR: Could not allocate isoc video buffer "
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"%i\n", k);
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return -ENOMEM;
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}
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peasycap->allocation_video_page +=
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BIT(VIDEO_ISOC_ORDER);
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peasycap->video_isoc_buffer[k].pgo = pbuf;
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peasycap->video_isoc_buffer[k].pto =
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pbuf + peasycap->video_isoc_buffer_size;
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peasycap->video_isoc_buffer[k].kount = k;
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}
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JOM(4, "allocation of isoc video buffers done: %i pages\n",
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k * (0x01 << VIDEO_ISOC_ORDER));
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/* Allocate and initialize multiple struct usb */
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JOM(4, "allocating %i struct urb.\n", VIDEO_ISOC_BUFFER_MANY);
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JOM(4, "using %i=peasycap->video_isoc_framesperdesc\n",
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peasycap->video_isoc_framesperdesc);
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JOM(4, "using %i=peasycap->video_isoc_maxframesize\n",
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peasycap->video_isoc_maxframesize);
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JOM(4, "using %i=peasycap->video_isoc_buffer_sizen",
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peasycap->video_isoc_buffer_size);
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for (k = 0; k < VIDEO_ISOC_BUFFER_MANY; k++) {
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purb = usb_alloc_urb(peasycap->video_isoc_framesperdesc,
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GFP_KERNEL);
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if (!purb) {
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SAM("ERROR: usb_alloc_urb returned NULL for buffer "
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"%i\n", k);
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return -ENOMEM;
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}
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peasycap->allocation_video_urb += 1;
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pdata_urb = kzalloc(sizeof(struct data_urb), GFP_KERNEL);
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if (!pdata_urb) {
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SAM("ERROR: Could not allocate struct data_urb.\n");
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return -ENOMEM;
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}
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peasycap->allocation_video_struct +=
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sizeof(struct data_urb);
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pdata_urb->purb = purb;
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pdata_urb->isbuf = k;
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pdata_urb->length = 0;
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list_add_tail(&(pdata_urb->list_head),
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peasycap->purb_video_head);
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/* Initialize allocated urbs */
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if (!k) {
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JOM(4, "initializing video urbs thus:\n");
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JOM(4, " purb->interval = 1;\n");
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JOM(4, " purb->dev = peasycap->pusb_device;\n");
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JOM(4, " purb->pipe = usb_rcvisocpipe"
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"(peasycap->pusb_device,%i);\n",
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peasycap->video_endpointnumber);
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JOM(4, " purb->transfer_flags = URB_ISO_ASAP;\n");
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JOM(4, " purb->transfer_buffer = peasycap->"
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"video_isoc_buffer[.].pgo;\n");
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JOM(4, " purb->transfer_buffer_length = %i;\n",
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peasycap->video_isoc_buffer_size);
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JOM(4, " purb->complete = easycap_complete;\n");
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JOM(4, " purb->context = peasycap;\n");
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JOM(4, " purb->start_frame = 0;\n");
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JOM(4, " purb->number_of_packets = %i;\n",
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peasycap->video_isoc_framesperdesc);
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JOM(4, " for (j = 0; j < %i; j++)\n",
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peasycap->video_isoc_framesperdesc);
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JOM(4, " {\n");
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JOM(4, " purb->iso_frame_desc[j].offset = j*%i;\n",
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peasycap->video_isoc_maxframesize);
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JOM(4, " purb->iso_frame_desc[j].length = %i;\n",
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peasycap->video_isoc_maxframesize);
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JOM(4, " }\n");
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}
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purb->interval = 1;
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purb->dev = peasycap->pusb_device;
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purb->pipe = usb_rcvisocpipe(peasycap->pusb_device,
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peasycap->video_endpointnumber);
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purb->transfer_flags = URB_ISO_ASAP;
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purb->transfer_buffer = peasycap->video_isoc_buffer[k].pgo;
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purb->transfer_buffer_length =
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peasycap->video_isoc_buffer_size;
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purb->complete = easycap_complete;
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purb->context = peasycap;
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purb->start_frame = 0;
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purb->number_of_packets = peasycap->video_isoc_framesperdesc;
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for (j = 0; j < peasycap->video_isoc_framesperdesc; j++) {
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purb->iso_frame_desc[j].offset = j *
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peasycap->video_isoc_maxframesize;
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purb->iso_frame_desc[j].length =
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peasycap->video_isoc_maxframesize;
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}
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}
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JOM(4, "allocation of %i struct urb done.\n", k);
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/* Allocate and initialize video urbs */
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rc = create_video_urbs(peasycap);
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if (rc < 0)
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return rc;
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/* Save pointer peasycap in this interface */
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usb_set_intfdata(intf, peasycap);
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